Thermodynamics/Help

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Question
Hello sir

Sir in my exam 1 question was In mcq form

When water boil

A) Temperature remains constant
B)Temperature increases as long as heat is supplied
C)none above
D)Both a and b

I marked option b because when water boils , its temperature increases as long as heat is supplied.If we take an vessel with 30 degree Celsius water and keep it for boiling , the temperature increases .

But my teacher told option a why sir.

Thankyou

Answer
Hi Aishwarya,

How can you heat water above its boiling point in an open system?
Because it is boiling it cannot get any hotter. It boils at 100 C. Not at 110 C!
As long as heat is supplied it will continue to boil at its boiling point (100 C) just making more steam.


I hope this helps.
Best wishes
Kevin

Thermodynamics

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Kevin

Expertise

Thermodynamics, chemistry, chemical reactions, kinetics, chemical reaction safety, dust explosion technology, static electricity. General science.

Experience

Over 40 years experience as a practicing thermochemist in industry. Head of the fire and explosion laboratory of a major European chemical company (Ciba-Geigy). Now retired.

Organizations
Institute of Chemical Engineers. Royal Society of Chemistry.

Education/Credentials
Chartered Chemist, Member of the Royal Society of Chemistry (C.Chem MRSC). Msc Sheffield.

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