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AIR BUOYANCY [28 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2025-11-14

English

Subject field(s)
  • Building Ventilation
  • Architecture
CONT

Passive ventilation is a method by which no forced air is used, like in a fan. Instead, passive ventilation systems utilize the wind along with rising heat force, called heat buoyancy or convection, to properly ventilate an area.

French

Domaine(s)
  • Ventilation (Construction)
  • Architecture
CONT

La ventilation passive exploite les forces naturelles telles que le vent et les différences de pression pour créer un flux d'air. Des évents d'entrée et de sortie stratégiquement placés favorisent la circulation naturelle de l'air.

Spanish

Save record 1

Record 2 2022-06-28

English

Subject field(s)
  • Maneuvering of Ships
  • Safety (Water Transport)
CONT

Ships may capsize and sink in water that is deeper than the beam of the ship. The sunken ship becomes an underwater obstruction and hazard to maritime traffic. Water depth around and over the ship at high water determines the extent and seriousness of the hazard and the urgency of removal. Refloating the ship upside down is sometimes suitable in such cases.... The refloated ship is to be scuttled in deep water, scrapped in a drydock, or taken to a location that can accept the upsidedown ship. Ships are refloated upside down by restoring their buoyancy with compressed air.

Key term(s)
  • re-floated ship
  • re-floated vessel

French

Domaine(s)
  • Manœuvre des navires
  • Sécurité (Transport par eau)

Spanish

Save record 2

Record 3 2021-01-25

English

Subject field(s)
  • Anti-pollution Measures
  • Water Pollution
CONT

A curtain boom has a large round foam or air buoyancy chamber floating on the water with a single piece of chain weighted fabric(PVC [polyvinyl chloride] or polyurethane) extending under water.... Approximately 40% of the boom is above the water and 60% below.

French

Domaine(s)
  • Mesures antipollution
  • Pollution de l'eau

Spanish

Save record 3

Record 4 2020-01-13

English

Subject field(s)
  • Underwater Diving (Sports)
CONT

A diver's basic skills, especially buoyancy control and air management, should be well honed before embarking on an ice dive.

French

Domaine(s)
  • Plongée sous-marine (Sports)
CONT

S'entraîner à la plongée sous glace fortifie la mémoire musculaire procédurale, mais d'abord elle modifie la perception.

Spanish

Save record 4

Record 5 2016-05-31

English

Subject field(s)
  • Types of Aircraft
DEF

An airship that generates buoyancy by heating air in a large chamber or envelope.

French

Domaine(s)
  • Types d'aéronefs
OBS

Un dirigeable à air chaud se compose d’une enveloppe et d’une cabine. Ces deux éléments sont interchangeables et une nouvelle enveloppe s’adapte à une cabine existante ou vice-versa. L’en­veloppe n’a pas de structure rigide; elle est construite en tissu polyamide de haute résistance, enduit d’une couche de silicone élastomère résistant aux hautes températures.

Spanish

Save record 5

Record 6 2015-04-14

English

Subject field(s)
  • Types of Aircraft
DEF

A balloon raised by the buoyancy of air heated by a fire placed in the lower part.

French

Domaine(s)
  • Types d'aéronefs
DEF

Aérostat qui s'élève dans les airs grâce à la force ascensionnelle de l'air chaud emmagasiné dans l'enveloppe.

OBS

montgolfière : nom des premiers aérostats auxquels la force ascensionnelle était fournie par l'air chaud.

Spanish

Campo(s) temático(s)
  • Tipos de aeronaves
DEF

Aerostato constituido por un recipiente elástico lleno de un gas más ligero que el aire, generalmente helio, que le permite elevarse en la atmósfera.

Save record 6

Record 7 2015-02-10

English

Subject field(s)
  • Types of Aircraft
DEF

Any aircraft supported chiefly by its buoyancy in the air.

OBS

lighter-than-air aircraft: term and definition officially approved by the International Civil Aviation Organization (ICAO).

OBS

lighter-than-air aircraft; aerostat: terms standardized by ISO.

French

Domaine(s)
  • Types d'aéronefs
DEF

Tout aéronef dont la sustentation est principalement due à sa flottabilité dans l'air.

OBS

aérostat : terme normalisé par l'ISO.

OBS

aérostat : terme et définition uniformisés par l'Organisation de l'aviation civile internationale (OACI).

PHR

Aérostat lenticulaire.

PHR

Surface latérale de l'aérostat.

Spanish

Campo(s) temático(s)
  • Tipos de aeronaves
DEF

Toda aeronave que se sostiene en el aire principalmente en virtud de su fuerza ascensional. [Definición aceptada oficialmente por la OACI.]

OBS

Los aeróstatos pueden agruparse en las siguientes categorías: globos libres y cautivos, globos sonda y dirigibles.

OBS

aeróstato: término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 7

Record 8 2014-11-10

English

Subject field(s)
  • Underwater Diving (Sports)
CONT

The constant volume suit is designed to eliminate the loss of buoyancy and insulation due to the reduction of the air space of the suit by water pressure

French

Domaine(s)
  • Plongée sous-marine (Sports)
OBS

[...] les vêtements dits à volume constant, combinaisons de toile caoutchoutée, munies de soupapes aux pieds et à la tête.

Spanish

Save record 8

Record 9 2011-09-15

English

Subject field(s)
  • Milling and Cereal Industries
DEF

In grain milling, machine used to separate bran particles and pieces of endosperm with adhering bran from particles of pure endosperm.

CONT

A purifier is essentially a long oscillating sieve, inclined downwards and becoming coarser from head to tail. Passing through the sieve in the direction from floor to ceiling are air currents. The buoyancy effect of the air causes the flour to stratify into endosperm chunks of different size. Thus, in addition to removal of bran, a purifier can be and is used to make a coarse separation of middlings.

OBS

Term used at the Canadian Grain Commission.

French

Domaine(s)
  • Minoterie et céréales
DEF

machine comprenant une à trois couches de tamis placés dans un bâti oscillant; elle utilise le principe de la séparation par grosseur et par densité pour calibrer un mélange d'albumen pur, de fragments vêtus et de particules de son, et les séparer

OBS

Terme en usage à la Commission canadienne des grains.

Spanish

Save record 9

Record 10 2009-01-07

English

Subject field(s)
  • Protective Clothing
  • Search and Rescue (Aircraft)
  • Search and Rescue (Paramilitary)
DEF

A garment designed to lessen the cooling and other deleterious effects of exposure to a wet and/or cold environment including immersion in water.

CONT

Other suits-often called floater, survival, or anti-exposure suits-can keep out cold air and provide buoyancy, but they are not designed to completely keep out water. Cold water may seep in through the seams and the zipper and gradually cool your body.

OBS

The terms "poopy-suit" and "poopie suit" are also used as slang terms for the more specific term "immersion suit".

Key term(s)
  • poopy suit
  • anti exposure suit

French

Domaine(s)
  • Vêtements de protection
  • Recherches et sauvetages (Aviation)
  • Recherche et sauvetage (Paramilitaire)
DEF

Vêtement conçu pour réduire le refroidissement et les autres effets nocifs d'un milieu humide et/ou froid, y compris ceux résultant du séjour dans l'eau.

Spanish

Save record 10

Record 11 2006-03-11

English

Subject field(s)
  • Civil Engineering
  • Concrete Facilities and Equipment
OBS

A floating platform consisting of an array of vertical concrete cylinders, six meters(20 feet) in diameter and 36 meters tall, that is open at the bottom and sealed at the top. Air trapped in the cylinders provides enough buoyancy for the platform to float. Interconnections between cylinders allow the air to move between them. And a few turbines can be added to exploit the movement of the air and generate electricity. It requires less maintenance, and is cheaper to build than a steel pontoon.

French

Domaine(s)
  • Génie civil
  • Outillage et installations (Bétonnage)
OBS

Pluriel : des plateformes, des plates-formes.

OBS

plateforme (sing.); plateformes (pl.) : Ces graphies, puisées des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, sont attestées dans le Petit Robert (2004).

Key term(s)
  • plateforme flottante en béton

Spanish

Save record 11

Record 12 2004-11-02

English

Subject field(s)
  • Sports Equipment and Accessories
  • Underwater Diving (Sports)
CONT

Because the scuba diver is constantly confronted with buoyancy variations caused by depth changes, it is important that a precise method of buoyancy control be available. Such a method is provided by means of a buoyancy control device, or BCD, which is tied into the air supply from the scuba tank.

Key term(s)
  • floatation vest

French

Domaine(s)
  • Équipement et accessoires de sport
  • Plongée sous-marine (Sports)
OBS

[Il s'agit d'un] gilet, collerette ou bouée, rapidement gonflé de gaz [qui] assure au plongeur une flottabilité positive croissante et le remonte automatiquement vers la surface [...]

Spanish

Save record 12

Record 13 2003-08-01

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Atmospheric Physics
  • Chimneys (Building Elements)
DEF

The ratio of lateral entrainment velocity to plume-rise velocity of a smoke plume.

CONT

Smoke plumes that rise through the environment due to buoyancy or momentum become diluted with environmental air, where the rate of dilution is proportional to the rise rate of the plume. The entrainment coefficient is this constant of proportionality. This concept of lateral entrainment does not work well for convective thermals in the atmospheric boundary layer. One reason is that boundary layer thermals are part of a large overturning circulation involving the whole boundary layer during statically unstable conditions of free convection, rather than being thin currents of rising smokestack air.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Physique de l'atmosphère
  • Cheminées (Éléments du bâtiment)

Spanish

Campo(s) temático(s)
  • Medición y análisis (Ciencias)
  • Física de la atmósfera
  • Chimeneas (Elementos de edificios)
Save record 13

Record 14 2003-07-24

English

Subject field(s)
  • Cooling and Ventilating Systems
  • Occupational Health and Safety
CONT

Receiving hoods are positioned to catch contaminants that are discharged from an operation in a predictable direction. Examples of receiving hoods include canopies located over a hot process in which hot exhaust fumes rise to the hood level by their own buoyancy, and hoods located adjacent to grinding wheels to catch the stream of dust generated by the spinning wheel. Receiving hoods may physically resemble capture hoods, but they differ with respect to the principle used for contaminant capture. Capture hoods operate at a higher flow rate to generate the air velocities necessary to capture contaminants from a source some distance from the hood opening. Receiving hoods, on the other hand, are positioned to catch the stream of contaminants delivered to them by forces intrinsic to the operation.

OBS

Hood designs can be placed into three broad categories based on the methods used to capture contaminants: exterior hoods, receiving hoods, and exhaust enclosures.

French

Domaine(s)
  • Systèmes de refroidissement et de ventilation
  • Santé et sécurité au travail

Spanish

Save record 14

Record 15 2000-09-27

English

Subject field(s)
  • Birds
DEF

Air-filled cavities that make up part of a bird's respiratory system, located under the skin between the internal organs and muscles as well as inside the bones. Air sacs are essential in respiration, are used to control buoyancy in aquatic species and play a role in thermoregulation. Their presence in the bones lightens the bird and facilitates flight.

CONT

Air sacs of birds. These are large bags acting as air-reservoirs connected to the lungs and to the cavities of the bones. During respiration the compression and expansion of these sacs causes air to be swept rapidly through the alveoli of the lungs. There is thus a very efficient respiratory exchange.

French

Domaine(s)
  • Oiseaux
DEF

Cavités remplies d'air associées à l'appareil respiratoire des oiseaux, réparties sous la peau, entre les viscères et les muscles ainsi qu'à l'intérieur des os. Les sacs aériens sont essentiels à la respiration, servent à contrôler la flottaison chez les espèces aquatiques et aident à la thermorégulation. Leur présence dans les os allège l'oiseau et facilite le vol.

CONT

Les cavités pneumatiques des os [chez les oiseaux,] communiquent avec de vastes sacs remplissant la cavité du corps, les "sacs aériens".

Spanish

Save record 15

Record 16 1999-02-24

English

Subject field(s)
  • Underwater Diving (Sports)
DEF

A device on the inflator hose of the BC [buoyancy compensator], connected to a low pressure port of the regulator first stage. It allows the diver to put air in the BC without removing the regulator second stage from the mouth.

French

Domaine(s)
  • Plongée sous-marine (Sports)
CONT

À la descente, pour ne pas toucher le fond inutilement, le plongeur gonfle sa veste à l'aide du gonfleur automatique.

Spanish

Save record 16

Record 17 1993-06-01

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
CONT

The distinction should now be well apparent between Bénard-Marangoni convection driven by surface tension effects and Rayleigh-Bénard convection resulting from buoyancy. But in a fluid layer open to air, the two mechanisms can operate simultaneously and we need an estimate of their relative strength, which can be obtained by a comparison of the induced velocities.

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
CONT

La distinction devrait maintenant être bien claire entre convection de Bénard-Marangoni contrôlée par la tension superficielle et convection de Rayleigh-Bénard due à la poussée d'Archimède. Mais, dans une couche fluide horizontale ouverte à l'air, les deux mécanismes peuvent opérer simultanément. Il faut donc estimer leur force relative, par exemple en comparant les vitesses induites.

Spanish

Save record 17

Record 18 1991-06-13

English

Subject field(s)
  • Water Pollution
  • Anti-pollution Measures
CONT

Solid flotation booms are favoured over air buoyancy units for long-term use, while a reliance on mechanical components is viewed as restricting the boom to short-term operations.

French

Domaine(s)
  • Pollution de l'eau
  • Mesures antipollution
CONT

Pour une utilisation de longue durée, les flotteurs solides sont préférés aux dispositifs de flottaison pneumatiques, tandis que les dispositifs mécaniques sont limités aux opérations de courte durée.

Spanish

Save record 18

Record 19 1991-06-13

English

Subject field(s)
  • Water Pollution
  • Anti-pollution Measures
CONT

Solid flotation booms are favoured over air buoyancy units for long term use, while a reliance on mechanical components is viewed as restricting the boom to short-term operations.

OBS

buoyancy : The resultant vertical force exerted on a body by a static fluid in which it is submerged or floating.

French

Domaine(s)
  • Pollution de l'eau
  • Mesures antipollution
CONT

Pour une utilisation de longue durée, les flotteurs solides sont préférés aux dispositifs de flottaison pneumatiques, tandis que les dispositifs mécaniques sont limités aux opérations de courte durée.

Spanish

Save record 19

Record 20 1991-06-05

English

Subject field(s)
  • Engineering Tests and Reliability
  • Waterproofing (Construction)
  • Building Ventilation
CONT

Determination of the airtightness of building envelopes by the fan depressurization method.... This is a method for the determination of the airtightness of building envelopes. It is not a method for determining the actual air leakage which occurs through a building envelope under the influence of wind and buoyancy pressures or the operation of heating and ventilation systems.... Principle. A fan or fans are used to exhaust air from the building at rates required to maintain specified pressure differences across the building envelope. The air flows and the pressure differences are measured. The intention is to subject the complete envelope to a simultaneous and similarly directed air pressure. The flows are corrected to reference temperature and reference pressure. The relationship between flow and pressure difference is used to calculate the equivalent leakage area of the building envelope. [Source : Standard 149. 10-M of the Canadian General Standards Board].

OBS

See also the Termium record for "fan test".

French

Domaine(s)
  • Fiabilité, contrôle et essais (Ingénierie)
  • Étanchéité (Construction)
  • Ventilation (Construction)
CONT

Détermination de l'étanchéité à l'air des enveloppes de bâtiment par la méthode de dépressurisation au moyen d'un ventilateur. [...] Il s'agit d'une méthode permettant de déterminer l'étanchéité à l'air des enveloppes de bâtiment. Il ne s'agit pas d'une méthode permettant de repérer les fuites d'air de l'enveloppe d'un bâtiment à cause du vent ou des différences de pression créées par le chauffage ou la ventilation. [...] Principe. Un ou plusieurs ventilateurs permettent d'extraire l'air du bâtiment avec un débit suffisant pour maintenir une différence de pression de part et d'autre de l'enveloppe. On mesure le débit d'air et les différences de pression. Le but est de soumettre toute l'enveloppe à une pression d'air homogène et appliquée de façon régulière. Les débits sont corrigés de façon à tenir compte de la température et de la pression. La relation qui existe entre le débit et les différences de pression est utilisée pour calculer l'aire de fuite équivalente de l'enveloppe du bâtiment. [Source : Norme no. 149.10-M de l'Office des normes générales du Canada (ONGC]).

Spanish

Save record 20

Record 21 1990-09-25

English

Subject field(s)
  • Heating
CONT

Gravity furnaces have the air passages through the casing and over the heat exchanger more generously proportioned so that the buoyancy force created by the air being warmed furnishes the motive power to circulate the air through the ducts. Floor furnaces are a variation of the gravity furnace and are designed to fit flush with the floor and distribute the heated air directly into the living area. Models that incorporate a means of forced air circulation are available.

French

Domaine(s)
  • Chauffage
OBS

Renseignement fourni par Louise Claude, terminologue auteure du BT sur le chauffage central.

Spanish

Save record 21

Record 22 1988-04-14

English

Subject field(s)
  • Atmospheric Physics
  • Environmental Studies and Analyses
  • Air Pollution
CONT

Puffy billowing cumulus clouds are manifestations of mesoscale circulations that owe their existence to buoyancy forces. Buoyancy forces lift an air parcel that is warmer than its surroundings. They are sustained by :(i) an unstably stratified atmosphere and(ii) the release of latent heat of condensation when cloud and rain drops form.

French

Domaine(s)
  • Physique de l'atmosphère
  • Études et analyses environnementales
  • Pollution de l'air

Spanish

Save record 22

Record 23 1987-06-09

English

Subject field(s)
  • Sports Equipment and Accessories
  • Underwater Diving (Sports)
CONT

Some air inflation in the buoyancy compensator and small amount of water in bladder.

French

Domaine(s)
  • Équipement et accessoires de sport
  • Plongée sous-marine (Sports)

Spanish

Save record 23

Record 24 1985-12-04

English

Subject field(s)
  • Air Pollution
CONT

Static stability... refers to what happens to a parcel of air after it has been given an initial vertical displacement, either upwards or downwards. If, after an upward displacement, the parcel is found to be warmer(less dense) than its surroundings, its buoyancy will make it move farther from its original position; it will continue to move until its temperature(and density) become equal to that of its surroundings.

French

Domaine(s)
  • Pollution de l'air
CONT

L'atmosphère pouvant être considérée comme système thermodynamique où, à moyenne échelle, aucun échange de température avec le milieu ambiant n'intervient à une vitesse suffisante pour égaliser les températures, on admet que tout déplacement vertical suit un processus adiabatique.

Spanish

Save record 24

Record 25 1985-06-17

English

Subject field(s)
  • Underwater Diving (Sports)
CONT

The [buoyancy compensator] has four basic functions : it acts as a hydrostatic organ, similar to the air bladder in most fish; it acts as a surface float, aiding the diver as he swims to and from his diving spot; it acts as a lift bag for light salvage work; and it can act as a safety device in an emergency.

French

Domaine(s)
  • Plongée sous-marine (Sports)
CONT

La technique de la pesée a été modifiée par l'apparition de la bouée gonflable qui permet de faire varier la flottabilité à la demande.

Spanish

Save record 25

Record 26 1984-06-01

English

Subject field(s)
  • Safety (Water Transport)
OBS

(life rafts shall have)... cubic feet of air cases or equivalent buoyancy appliances

French

Domaine(s)
  • Sécurité (Transport par eau)
OBS

(Règlement concernant les engins de sauvetage, art. 27. Gaz. 23-1954)

Spanish

Save record 26

Record 27 1983-09-29

English

Subject field(s)
  • Botany
OBS

In many conifers the exine balloons out to form two or three hollow wings, which increase the buoyancy of the pollen grain... and facilitate transportation by air currents.

French

Domaine(s)
  • Botanique
CONT

Expansion alaire de l'exospore.

Spanish

Save record 27

Record 28 1977-06-07

English

Subject field(s)
  • Insects, Centipedes, Spiders, and Scorpions
CONT

In the bee there are a number of large thin-walled air sacs connected to the tracheal system. These give buoyancy to the insect by lessening its weight without decreasing its size, and they also increase the efficiency of the bee's respiratory system.

French

Domaine(s)
  • Insectes, mille-pattes, araignées et scorpions
CONT

"Sur le trajet des trachées se trouvent des renflements qui jouent dans l'acte du vol un rôle important, diminuant le poids spécifique de l'insecte en se remplissant d'air (...)"

Spanish

Save record 28

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