air bag
nothing Glossary
Closing speed The effective speed of impact of two moving objects. If the objects are moving directly toward each other, closing speed equals the sum of the speeds of the individual objects.

Decelerate To lose velocity.

Propellant A chemical that expands in a chemical reaction, moving a rocket forward.

Charles' law At a constant pressure, the volume of a fixed mass of gas varies with its absolute temperature (measured in Kelvins).

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