Advertisements
Advertisements
Question
Under what conditions heat can be given to a substance without raising its temperature ?
Solution
When a substance is melted or vaporised, heat is constantly absorbed but the temperature doesn’t rise because of latent heat of fusion or latent heat of vaporisation.
APPEARS IN
RELATED QUESTIONS
Tick the most appropriate answer.
Melting of ice is a
The boiling point of alcohol is 78° C. What is this temperature on Kelvin scale ?
What is meant by saying that the latent heat of fusion of ice is 3.34 × 105 J/kg ?
Explain why, steam at 100° C is better for heating purposes than boiling water at 100° C.
How does perspiration or sweating help keep our body cool on a hot day ?
When water at 0°C freezes to form ice at the same temperature of 0°C, then it :
Give reasons:
Why a solid does not flow, but a liquid flows?
Give two examples of the following:
Substances which do not change their states.
Give two examples of the following:
Substances which are rigid and not compressible
In the paragraph below, write ‘solid’, ‘liquid’ or ‘gas’ in each of the brackets depending on the substance referred to just before.
On a bright sunny day, Riya and Gargi are playing with a ball ( ) in the park. Gargi feels thirsty. So, Riya brings tender coconut water ( ) for her. At the same time, a strong breeze ( ) starts blowing and it also begins to rain ( ). They run back into the house ( ), change their clothes ( ), and then their mother gives them a cup ( ) of hot milk ( ) to drink.
