CLIMATE OF INDIA
EL NINO AND SOUTHERN OSCILLATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the fact that it’s less dense than cold air
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The fact that it weighs more than cold air
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The fact that it has higher pressure than cold
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the fact that its more dense than cold air
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Detailed explanation-1: -As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
Detailed explanation-2: -Air expands on heating. Therefore the same amount of hot air occupies more space (volume) than the cold air, so hot air is less dense than cold air (If volume is more, then the density will be less).
Detailed explanation-3: -But why does this happen? As air warms near the surface of the Earth, or on the first floor of a home, the air molecules move around faster, creating more space between those molecules making the air less dense than the cooler air above it. The warm, less dense air rises while the cooler, more dense air sinks down.
Detailed explanation-4: -The difference in barometric pressure between observation sites at different elevations is a measure of the density of air in a column of air between those two elevations. Cold air is denser than warm air.
Detailed explanation-5: -LL WAA contributes to rising air because warm air is less dense than cold air. Since warmer air expands to a larger volume than cold air, this expansion in the low levels pushes the air above the low levels up also.