Question

how the interior of a car parked in the hot sun warm easily?

Answer 1

As the windows of the car is made up of glass, we know that glass allows heat to pass in through it. So when solar radiations fall on the glass , the glass allows the heat to pass through in and the car gets warm easily.
Hope this helped u....

Answer 2

Whenever a car is parked under direct sunlight, the inside temperature can soar to dangerously threatening levels. The principle behind this phenomenon is called Greenhouse Effect.

Here is how it works:

Sunlight travels from the sun in the visible part of the spectrum (white light). The sunlight is absorbed by the surface of the car (e.g dashboard and the carpet). Since sunlight is radiated energy, the impact surface heats up due to absorption of this radiated energy.

Now the important part: Every object emits energy which is a function of the temperature of that body. For example, human beings with 100°F of body temperature emits radiation in the INFRARED part of the spectrum. Human eyes cannot see infrared light and hence we cannot see radiated energy from our body. But special night vision cameras can detect this radiated energy. Snakes, for example, can see infrared light and hence detect presence of rodents (who has a higher temperature than the surrounding).

Therefore, sunlight falls on the carpet and plastic parts within the car and then they re-radiate that energy in infrared spectrum. Now, water vapor and CO in the air within your car will absorb this re-radiated IR energy and thus, the heat gets accumulated continuously. This heat is trapped inside the car as there is no exit point.