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Because when the cap is removed the liquid inside wants to start cooling itself. The heat energy is released by boiling.

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15y ago

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Why does the water in a car radiator sometimes boil explosevly when the radiator cap is removed?

When the radiator cap is removed, the pressure inside the radiator is released suddenly, causing the water to boil explosively due to the rapid decrease in pressure. The water in the radiator is under pressure to raise its boiling point, and when that pressure is suddenly relieved, the water can boil and turn to steam very quickly, leading to an explosive release of steam and hot water.


Why does the water in a car radiator sometimes boils explosivebly when the radiator cap is removed?

Water boils at 212F at Sea level pressure, 14.5 psi or so. If the pressure is increased, so is the boiling point. This is how a pressure cooker cooks with water at up to 500 degrees, and how a nuclear reactor can heat water to almost 3000 degrees, without boiling. Also, water will boil at room temperature or less, if you reduce the pressure, such as applying a vacuum pump to the container. When you open that radiator cap, it causes a drastic change in pressure, a drop. If the water is only warm, just under 200F, say, it will likely just boil violently. If it is above the normal boiling point, that pressure was all that was keeping it liquid. This violent change from liquid to gas is known as flashing. It changes states of matter, and releases a huge and violent amount of energy. This flash is what turns the turbines in power plants, by the way.


Does the radiator have to be removed to replace the water pump on 00 grand Cherokee limited v8?

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Where is the oil pan drain plug for the radiator in a 1995 Mazda Protege?

There is a drain plug on the oil pan that when removed you get oil, and a radiator drain plug that when removed you get antifreeze/water. The radiator drain plug is located at the bottom of the radiator (very front of engine compartment). Typically you can find it by reaching up behind the front bumper and feeling for a large-ish wingnut. They are usually plastic, about the size of a quarter or half-dollar, and can be removed by hand.


Why is water boiling out of the radiator?

if its out of the top you might need a new cap they are pressurized and sometimes the spring is bad


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What is the name of the compound oxygen and hydrogen can combine explosively to form?

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If there is water in the radiator then what?

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