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On a hot day, a car is left in sunlight ...

On a hot day, a car is left in sunlight with all the windows closed. After sometimes, it is found that air inside the car is considerably warmer than the air outside. Explain why?

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Glass transmits about 50% of heat radiations coming from a hot source like the sun but does not allow the radiations from moderately hot bodies to pas through it. Due to it, when a car is left in the sun, heat radiations form the sun get into the car but as the temperature inside the car is moderate, they do not pass back through its windows. Hence, the air inside the car becomes considerably warmer.
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