Advertisements
Advertisements
Question
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
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 temperature at which a solid convert into a liquid is called its .........
Molecules of a substance are always in a state of............ and so they possess .............
Explain the term Melting.
Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
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?
______ is the changing of a liquid into its solid state and it happens by cooling.
A puddle of water gets pooled around the glass of ice cream or a glass of ice cubes. When it is kept at room temperature. Give reason.
Sweating causes cooling because water has a ______.
A change of state is a change of a substance from ______.
