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Chapter 12: Q12.18P (page 494)

Why does water vapour at100oCcause a more severe burn than liquid water at100oC?

Short Answer

Expert verified

The water vapour at 100oCcauses a more severe burn than the liquid water at the same temperature because as the vapour comes in contact with the skin, it gets condensed. This process involves the release of heat energy and thus the vapour effect is more than the liquid form.

Step by step solution

01

Step-1: Condensation process 

When the vapour comes in contact with the any cool surface, the process of condensation takes place which involves the conversion of gaseous form to liquid form. The condensation reaction is anexothermic process and thus releases heat energy.

02

Step-2: Effect on Skin

As the water vapour at 100oCtouches human skin (acts as a solid surface), the condensation processtakes place. The release in heat energy gives more itchiness and thus severe burn.

When the same burn takes place with liquid water atthere is no such release of heat energy, thus the burn is comparatively less severe.

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Most popular questions from this chapter

Question: On a humid day in New Orleans, the temperature is , and the partial pressure of water vapor in the air is 31.0 torr. The 9000-ton air-conditioning system in the Louisiana Superdome maintains an inside air temperature of also, but a partial pressure of water vapor of 10.0 torr. The volume of air in the dome is , and the total pressure inside and outside the dome are both 1.0 atm.

a. What mass of water (in metric tons) must be removed every time the inside air is completely replaced with outside air?

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