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CBSE Notes 2011-2012 » XI-Chemistry

States of Matter : Gases and Liquids

Why is air denser at lower level than at higher altitudes ?

Short answer question

Why is air denser at lower level than at higher altitudes ?

Why is moist air lighter than dry air ?

Short answer question

Why is moist air lighter than dry air ?

Name the S.I. unit of pressure and give its definition.

Short answer question

Name the S.I. unit of pressure and give its definition.

Liquid ammonia bottle is cooled before opening the seal. Why ?

Short answer question

Liquid ammonia bottle is cooled before opening the seal. Why ?

The tyre of automobile is inflated to lesser pressure in summer than in winter. Why ?

Short answer question

The tyre of automobile is inflated to lesser pressure in summer than in winter. Why ?

The size of weather balloon becomes larger and larger as it ascends up into higher altitudes. Why ?

Short answer question

The size of weather balloon becomes larger and larger as it ascends up into higher altitudes. Why ?

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