Why are tyres of automobiles infliated to lesser pressure, in summer than in winter?

How will you account for the observation that automobile tyres is inflated with lesser air in summer than in winter?

Why cotton dress is preferred in summer?

Why more viscous oil is used in summer than in winter in scooters?

When an automobile travels long distance air pressure in tyres increases slightly. Why?

Why are the gases more compressible than liquids?

Write examples for liquids of density greater and lesser than that of water.