英语翻译Convection is the tra - 已解决

英语翻译Convection is the transfer of heat from one place to ano

英语翻译

Convection is the transfer of heat from one place to another within a liquid or gas by mixing one part of liquid or gas with the other.It could be defined as the process by which gases and liquids move about,due to changes in temperature and pressure.A gas or liquid expands when heated.It becomes lighter and moves upward as gravity pulls the heavier,less heated gas or liquid downward.The transfer of heat by convection is used both in heating and in cooling our homes.

A steam radiator is a good example of heating by convection.Air in contact with the radiator warms and rises because it is lighter than the other air in the room.It is displaced by cooler air.

Radiation is the transmission of heat from a heated body to cooler body by heat waves or the transfer of heat by electromagnetic waves.Similar to radio signals,radiation can transfer energy through empty space.Unlike conduction and convection,radiation does not require a substance to transfer heat.

The heat we get from the sun is an example of radiation.Another example is warming one's self by an open fire.The side next to the fire gets warm while the opposite side remains cool.Turn around and the cool side warms up and the warm side cools off.Since you are not actually touching the fire,this warming cannot be by conduction.Likewise,it cannot be heat transmission by convection for only the side next to the fire is warmed.If it had been heat by convection the both sides would have been warmed.

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对流是转移的热量从一个地方到另一个地方在液体或气体的一份液体或气体和其他它可以被定义为一种过程,气体和液体四处走动,由于温度和压力的变化气体或液体受热时扩大…它变得更轻、移动向上的重力拉重,少被加热的气体或液体向下转移的热量对流均采用在加热和冷却的家园.

蒸汽暧气片是一个很好的例子,对流加热空气接触的散热器温暖和上升,因为它比其他空气的房间它是流离失所的冷空气.

辐射传输热量从一个加热体冷却器人体的热浪或转移的热量被电磁波的.类似的,可转让的无线电信号,辐射能量通过空与传导和对流辐射并不需要一种物质传热.

炎热的太阳让我们从实例的辐射另一个例子是由全球变暖的篝火这边的火暖和而对面就保持凉爽转过身来,凉爽的边取暖和温暖的边冷静下来因为你并不真正接触火焰,这种气候变暖不能由传导同样地,它不能换热对流只有一侧旁边的火是温暖的.如果它被热对流的两边会回暖.

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