2007-05-13 04:31:34 · 8 answers · asked by Justin M 1 in Science & Mathematics ➔ Physics
because the water is heated to boiling point in a pressurized environment, so when you open the radiator cap the air pressure forces the water out!
ten points please lol!
2007-05-13 04:34:55 · answer #1 · answered by monkeynuts2006 4 · 0⤊ 1⤋
Because it has become superheated (more than 100°C) and at higher than atmospheric pressure.
Opening the cap while still hot can be very dangerous causing severe scalding.
When the cap is removed while hot, the sudden pressure drop to atmospheric causes the water to vaporise instantly and explosively. The temperature immediately drops to 100°C and the steam released expands by 1800 times the volume of the water.
2007-05-13 13:25:42 · answer #2 · answered by Norrie 7 · 0⤊ 0⤋
First, it should not be just water. Second, it is under pressure, so the water and other fluid are hotter than their normal boiling points. When you remove the cap, you remove the pressure, and it boils off rapidly until it is all gone or the remaining liquid's temperature is below its boiling point.
2007-05-13 11:43:16 · answer #3 · answered by thylawyer 7 · 0⤊ 0⤋
water boils when its vapour pressure becomes equal to the ambient pressure.....so when the cap of the car radiator is closed the vapours thus formed remain in the small space thus increasing the pressure in the radiator.....due to high pressure the water in the radiator is at a higher temperature(more than 100 deg C)....so when the cap is opened the vapours escape out reducing the pressure.....thereby causing the water to boil.....
2007-05-13 11:41:52 · answer #4 · answered by bikash_the_gr8_1 2 · 0⤊ 1⤋
Actually the thing is not that.........when the cap is closed..the water gets heated and is boiled....this water vapour produces pressure inside the cap...now when you remove the cap this vapour explosively comes out .....this phenomenon looks like boiling
2007-05-13 11:38:19 · answer #5 · answered by machina 2 · 0⤊ 1⤋
Check the phase diagram of water, link given below. At higher pressures, water boils at higher temperatures. Radiator water is kept under pressure, so that it stays a liquid at high temperatures. When the pressure is suddenly released, it will suddenly boil.
2007-05-13 11:37:29 · answer #6 · answered by Scythian1950 7 · 1⤊ 1⤋
cuz its really hot and the superheated vapors build up pressure in the system . you relesse that pressure opening the cap
2007-05-13 11:34:52 · answer #7 · answered by Anonymous · 0⤊ 1⤋
there is a separate pipe is given to go out the steam but if you can play monkey business it will harm you
2007-05-13 11:37:14 · answer #8 · answered by jagdish T 2 · 0⤊ 1⤋