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?

Explanation

About 50% of heat radiations, coming from a hot source like Sun, are transmitted by the glass but it does not allow the radiations from moderately hot bodies to pass through its surface. So, when the car is left out on a hot sunny day, with all its glass windows closed, the heat radiations from the sun are transmitted through the glass inside the car but as the temperature inside the car is moderate, so heat radiations do not pass back through the windows. As a result, the inside of the car becomes considerably warmer than the outside.