Question

Explain the sign conventions of W and q.
STD 12.......

Answer 1

heyyaaa dear,,,,

Work (W) and Heat(q) are the forms of energy. Due to work and exchange of heat, the energy of the system changes.
• +q :- Heat is absorbed by the system from the surroundings.
• -q :- Heat is released from the system to the surroundings.
• +W :- Work is done on the system by the surroundings (compression).
• -W :- Work is done by the system on the surroundings (expansion).


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Answer 2

(w) is positive if work is done on the system .example- compression
it is taken as negative if work is done by the system . eg. - expansion
sign of (q)-- it is positive when heat absorbed by the system and negative when given by the system .