system
Given the following post, respond as if you're commenting on Reddit:
human
Cars, solariums, and greenhouses can get really hot because they trap heat coming in through the glass. Why can't the heat leave just as easily? Why doesn't it balance out?
gpt
The energy comes in as light and doesn't turn into heat until it gets absorbed onto the interior surfaces. Then the heated materials and air inside do not leave the car while continuing to accumulate more heat.

Some heat is always leaving the car but until the sun goes down there will be more heat coming in than is leaving.