Why temperature drops as altitude increase

You know that the atmospheric pressure is high near Earth’s surface and low at higher altitudes. (Read Atmospheric air pressure) This means the air is more compressed near earth’s surface than at higher altitudes.

Since the air is compressed at earth’s surface (low altitude) than at higher altitudes say a mountain, the temperature is high at low altitude.

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Electromagnetic radiation and light

Light is a electromagnetic radiation. It travels in wave form with infinite number of energy pockets called “photons”. As we all know, a wave form has amplitude, frequency and wave length as its main parameters.

The speed of all electromagnetic radiation or EM waves in vacuum is 299,792,458 meters per second. So no matter what the parameters are, if waves start from a point at a time, they will reach the other point at the same time.

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What is Kelvin and Why 273 Kelvin is used for temperature conversion

Celsius, Fahrenheit and Kelvin are the units for measuring temperature. A temperature value can be expressed in any one or all of the above units independently. The values can be converted from one unit to other unit still keeping the meaning same.

We use the number 273 (273.15 exactly) to convert from Celsius to Kelvin and vice versa.

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