Exhaust

Exhaust or exhaustion may refer to:

• Exhaust gas, a gas which occurs as a result of combustion of fuel
• Exhaust system, a mechanism for venting exhaust gases from an internal combustion engine
• Exhaust velocity, a measure of engine efficiency
• Exhaust brake, a method of slowing diesel engines
• Exhaust manifold, a structure collecting an engine's exhaust outlets
• In steam engines, steam released from a cylinder