When a motor car tyre bursts, the air coming out is cooler than the surrounding air ,explain.

Is moist air heavier than dry air? Explain.

When the tyre of a bicycle or motor car bursts suddenly, cool air comes out from the tube. Explain why.

The distance between two places is 200 km. The time taken by moter car to travel from one place to another is more by 2 hrs than the time taken by a zeep car.If the speed of the motor car is 5 kms/hr less than the speed of the zeep car, then find the speed of the motor car.

PCl_(3) fumes is moist air - explain.

When freshly cut, the alkali metals appear lustrous but their swfaces get tarnished when exposed to air. Explain your answer with reasons.