why is it sometimes hotter in a car than outside.?

Answer 1

Recent studies have shown that even on days when the outside air temperature is as cool as 70 degrees, the interior of an enclosed vehicle left in the sun can reach lethal temperatures of 105 degrees.

The interior of a car or van warms very rapidly on a sunny day. Even cracking the windows is not enough to significantly mitigate temperature increases. As sunlight enters a car, it heats up the interior surfaces, such as the upholstery and the dashboard, to temperatures that can easily exceed 150 degrees. In turn these objects warm the air inside the vehicle, which gets hotter and hotter because the air is trapped inside the vehicle.

In a study of 16 cases last summer on days when the outside air temperatures ranged from 72 to 96 degrees, the interior of a test vehicle reached readings of 112 to 140 degrees after an hour. The average temperature increase inside after just 10 minutes was 19 degrees, then 29 degrees after 20 minutes and 34 degrees after a half hour. After an hour, the temperatures slowly stabilized between 45 and 50 degrees above the outside air temperatures.

The same study found that the effects from either cracking the windows or having a larger lighter-colored vehicle were not significant enough to keep temperatures from reaching deadly levels.

The atmosphere and windows are relatively “transparent” to the sun’s shortwave radiation (yellow in figure below) and are warmed little. The shortwave energy does however warm objects that it strikes.

These objects (e.g., dashboard, steering wheel, childseat) heat the adjacent air by conduction and convection and also give off longwave radiation (red) which is very efficient at warming the air trapped inside a vehicle.

Answer 2

Because the car glasses which are transparent absorbs the total heat from outside and there is not way out for that heat.so,it always becomes hotter and hotter than the outer climate.

Answer 3

Heat radiation comes in a broad band of frequencies. The heat from the sun (infra-red radiation) will go through the glass and heat up both the air and the solid objects inside the car. Then the air and solids in the car start to emit their own heat, but it's at a different infra-red frequency, and it won't pass back through the car windows as easily. So the heat stays in the car.

Answer 4

Heat circulates which stays inside a car(its like Insulation)because no air is coming in.

Answer 5

for one the car is inclosed and the air is not moving therefore the warmth is not displaced and second during the day the sun is generating warmth and if the car stays closed the warmth stays in place

Answer 6

In the car probably you have a heater on and if not then the window is blocking the air.

Answer 7

when heat waves of shorter wavelength enters your car, the wavelength increases. the increased wavelength cn escape from your car and gets reflect back.

overtime the accumulation of heat waves in your increases the internal temperature

Answer 8

the heat thats in the car gets insulated.

and it doent go away.

=]

Answer 9

Cause the heat is on silly!