Question

explain why it is more dangerous to burn from steam than from boiling water although both are at same temperature
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Answer 1

#BAL

“Boiling water” complicates the answer a little because there is steam being produced in water that at sea level is boiling at 212 degrees F., and both forms of which are present in an unpressurized container at 212 degrees F.

The heat of vaporization of water is 533 calories/gram of water. That means that steam at 212 degrees F. has quite a lot more of heat available to burn skin than water, even boiling water, at the same temperature because as gaseous steam reverts to water, the heat that such a condensation process releases is high compared to the heat loss (about half a calorie) when the temperature of water simply decreases from 212 degrees F. to 211 degrees F.

Let us assume that scalding occurs at about 130 degrees F. (although skin scalding by water can be defined as 150 degrees F. occurring for a much shorter period of time). That amounts to a 82 F. degrees drop in temperature and a release of 41 calories, about 7.7% of the heat of vaporization at 533 calories/gram of water.

You do not want to be burned by steam.

And, if the steam is being released onto skin is under pressure with an attendant higher temperature of the steam, even though the specific heat of steam is only about half that of water, the higher temperature of that pressurized steam just makes the burn more severe.

Answer 2

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1. A given quantity of steam contains more heat than the same quantity of boiling water at the same temperature.

2. When steam comes in contact with one's body, it releases extra heat of 540 calories per gram and causes a more serious burn than that caused by boiling water.

Hope it helps!

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