{"id":2992,"date":"2016-09-17T07:41:55","date_gmt":"2016-09-17T07:41:55","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=2992"},"modified":"2016-11-30T04:40:03","modified_gmt":"2016-11-30T04:40:03","slug":"heat-transfer-radiation","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/heat-transfer-radiation\/","title":{"rendered":"Heat Transfer by Radiation"},"content":{"rendered":"

Heat<\/a> Transfer by Radiation<\/strong><\/h2>\n

Heat energy can travel in the form of waves, just like light. These waves (both heat and light, and many other types of waves) are called electromagnetic waves. Energy travelling in this form is called radiation. Just like light can travel – in different media (like air, water, etc.) and in vacuum, heat radiations can also travel in different media and in vacuum.<\/p>\n

All bodies give out energy that travels in the form of radiation (much like light) through space.\u00a0Energy from the sun reaches us through radiation.\u00a0Bodies that absorb this radiation become hot.\u00a0All objects radiate heat energy, and this property is used in infrared photography.
\nThis helps us ‘see’ objects in complete darkness. Some animals can ‘see’ in the infrared. For example, rattle snakes have special detectors with which they can ‘see’ in absolute darkness by detecting the heat radiated by warm\u00adblooded animals.<\/p>\n

The amount of heat energy that is absorbed by a body depends on its colour. Bodies that are black absorb more of radiated heat than white bodies. We feel more comfortable wearing white and light-coloured clothes in summer. This is because white clothes absorb comparatively less amount of heat than dark clothes, and therefore keep us relatively cooler.<\/p>\n

The reverse applies in winter; we are more comfortable in dark clothes. This is because we need to absorb as much heat as possible from our surroundings to keep ourselves warm, and dark clothes absorb more heat than light-coloured ones. The reverse is also true. Black and dark bodies radiate more heat than light-coloured bodies.<\/p>\n

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