why a gas expand when heated
Answers
Answer:
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Explanation:
Heating Causes increas in kinetic energy of the particles. causing the gas to expand. ... Increasing temperature without increasing the volume available to accommodate the expanding gas means that pressure builds up inside the container and may cause it to explode.
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Answer:
This great thermodynamic and non intuitive phenomenon is what runs our economy today !
Well, you might be knowing that as we provide heat to any system, it would make the particles more vigorous with their movements inside the system, or in other words their agitation or the internal energy of the system would increase.Internal energy increasing means more random motion of the particles , which would increase the pressure inside the system.
And, hence the particles would forcefully apply force on the surroundings from the boundary, since (P in > P ext)
and, now it is easily considerable that the gas expands i.e the system does work on the surroundings.
All of this mathematically gives, the First Law of thermodynamics !
That says, Heat(Q) = Work(W) + Internal energy(U)
However this is not absolutely true since it all depends on the sign conventions which you might learn or may have learnt !
Hope this helps you !