TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

The sound that results from the formation of lightning. This burst of lightning expands air around it, producing an effect similar to an explosion, thus creating the noise.  2, record 1, English, - thunder

Record number: 1, Textual support number: 1 CONT

Thunder is the noise caused by the explosive expansion of air due to the heat generated by a lightning discharge. Thunder may have a sharp cracking sound when lightning is close by, compared to a rumbling noise produced by more distant strokes.  3, record 1, English, - thunder

Record number: 1, Textual support number: 2 CONT

Thunder ... moves through the atmosphere at a speed of about one mile in five seconds. To obtain the distance in miles of a lightning bolt, count the number of seconds between flash and thunder, then divide by five.  4, record 1, English, - thunder

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Onde acoustique, se manifestant par un bruit sec ou un roulement sourd, accompagnant un éclair et qui est due à la dilatation brusque de l'air par réchauffement le long du trajet de l'éclair.  2, record 1, French, - tonnerre

Record number: 1, Textual support number: 1 CONT

L'impression auditive de roulement perçue par un observateur à distance a pour origine un phénomène de battement entre les ondes émises tout au long de l'éclair. Le tonnerre peut être entendu jusqu'à environ 25 kilomètres de distance. En raison de la vitesse de la lumière (300 000 kilomètres par seconde) la détection visuelle d'un éclair peut être considérée comme instantanée, alors que le «coup de tonnerre» qui lui est associé se transfère à la vitesse du son, soit approximativement 330 mètres par seconde. Ainsi en divisant par trois l'écart de temps exprimé en secondes entre la perception de l'éclair et l'audition du coup de tonnerre, on obtient une estimation approchée de la distance de l'orage, en kilomètres.  2, record 1, French, - tonnerre

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Ruido que produce un rayo cuando se propaga por la atmósfera.  2, record 1, Spanish, - trueno

Record number: 1, Textual support number: 1 CONT

En el instante que se produce el rayo se origina el trueno. El calor producido por la descarga eléctrica calienta el aire y lo expande bruscamente, dando lugar a ondas de presión que se propagan como ondas sonoras. Cuando esas ondas sonoras pasan sobre el observador, este percibe el ruido denominado trueno. Como la velocidad de la luz es de 300.000 km/s, el relámpago se ve casi al instante en que tiene efecto, pero no ocurre lo mismo con el trueno, ya que el sonido se propaga más lentamente, a unos 300 m/s. Por esto el trueno se oye después de desaparecer el relámpago.  3, record 1, Spanish, - trueno

Record number: 1, Textual support number: 1 OBS

Se debe a la expansión rápida de los gases a lo largo de un canal de descarga eléctrica.  4, record 1, Spanish, - trueno

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

Objects in the path of direct-stroke lightning can be severely damaged due to heat, mechanical forces and direct ignition of flammable and combustible materials.  1, record 2, English, - direct%20stroke%20lightning

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Impact qui frappe directement la structure ou son installation de protection contre la foudre.  1, record 2, French, - coup%20de%20foudre%20direct

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

Lightning flash at a distance which may be observed as a short illumination of the sky or of a cloud.  2, record 3, English, - heat%20lightning

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Éclair lointain que l'on peut observer comme une brève illumination du ciel ou d'un nuage.  2, record 3, French, - %C3%A9clair%20de%20chaleur

Record 3,  Textual support,  Spanish

Record number: 3, Textual support number: 1 DEF

Resplandor distante que produce una iluminación breve del cielo o de una nube.  1, record 3, Spanish, - rel%C3%A1mpago%20de%20calor

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

The new 60-megawatt segmented arc heater, known as H3, significantly improves AEDC' s [Arnold Engineering Development Center] present arc capabilities... Arc heaters such as H3 produce the high pressures and heat fluxes required for testing thermal protection materials used for nose tips and heat shields. Arc heater tests provide information to manufacturers about the probable condition a space vehicle component would experience following re-entry into Earth's atmosphere. An arc heater is basically a large tube that high-pressure air runs through. The air is heated by discharging tens of megawatts of power using an electric arc similar to a lightning bolt. At the nozzle, or downstream end of the heater, test personnel install models or materials and subject them to simulated high pressure and temperature conditions generated by the bolt. Temperatures range from 5, 000 to 15, 000 degrees Fahrenheit, requiring each component to be water-cooled.  2, record 4, English, - segmented%20arc%20heater

Record 4,  Textual support,  French

Record 4,  Textual support,  Spanish