Advertisements
Advertisements
Question
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
Advertisements
Solution
Water in the form of ice has low energy since water freezes at a lower temperature. When ice comes in contact with body it draws heat from the body and gives cooling effect. In case of steam, the water molecules have high energy. The high energy of steam is transformed as heat and may cause severe burns.
APPEARS IN
RELATED QUESTIONS
The fixed temperature at which matter changes state from solid to liquid is called ______.
What is melting? Give example.
A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig. 1.1) would correctly represent the result? Justify your choice.
Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?
It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why?
In an endothermic process, the speed of the molecules is ______ hence they move faster.
A change of state is a change of a substance from ______.
The solid, liquid, and phases of water can coexist in equilibrium at ______.
Define latent heat of fusion?
Explain the following effects of heat.
Change in state
