Answer:
pressurized gas
Step-by-step explanation:
A gas which is under high pressure is likely to explode or catch fire. Such gases are very sensitive to heat and instantly catches fire when certain heat is supplied to the gas by means of friction. They are highly inflammable gas and readily gets ignited. When the gas is heated without giving space for the gas to expand, the gas explodes thus catching fire.
Thus, pressurized gas is easily ignited and is very sensitive to heat and friction.