Okay, I've been wondering this one all summer. Whenever I open my car door, I'm greeted by a wall of very hot air, which takes a while to cool down, of course, with the air conditioning. So I was wondering, if when I parked my car, I could flip a switch and create a perfect vacuum inside, would it be as hot when I got in hours later? Assume that my car is parked in direct sunlight without shade throughout the day.
Without air, would surfaces such as seats (indirect sunlight) get as hot or hotter? Ordinarily, does the air usually provide a bit of insulation to absorb some of the incoming heat? Or, does the air serve to trap the heat inside the car?