State two facts which shows that heat from the sun does not reach the earth surface by convection
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Answer:
Convection and conduction are impossible in a vacuum. Therefore, solar heat does not reach the earth by conduction or convection.
The sun's heat reaches the Earth only through radiation. because unlike radiation, convection and conduction needed an environment to transfer heat energy.
• Hence, convection and conduction are impossible in a vacuum.
Therefore, solar heat does not reach the earth by conduction or convection.
Natural convection results from the tendency of most liquids to expand when heated, i.e. become smaller and rise due to higher buoyancy. The circulation created by this effect causes uniform heating of water in a kettle or air-heated room: the heated molecules expand the space, where they move at a higher speed against each other, rise up, then cool and approach each other again. Density increase and consequent subsidence.
This is a problem of heat.
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Convection and conduction are impossible in a vacuum. Therefore, solar heat does not reach the earth by conduction or convection.
The sun's heat reaches the Earth only through radiation. because unlike radiation, convection and conduction needed an environment to transfer heat energy.
• Hence, convection and conduction are impossible in a vacuum.
Therefore, solar heat does not reach the earth by conduction or convection.
Natural convection results from the tendency of most liquids to expand when heated, i.e. become smaller and rise due to higher buoyancy. The circulation created by this effect causes uniform heating of water in a kettle or air-heated room: the heated molecules expand the space, where they move at a higher speed against each other, rise up, then cool and approach each other again. Density increase and consequent subsidence.
Heat can't be transferred from sun to earth by conduction, because air is a bad conductor of heat. Convection is the transfer of heat in gases & liquids. Convection occurs when a heated fluid moves away from the source of heat and comes in contact with other substances, transferring some of their energy.
This is a problem of heat.
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