Which set of the following are correct, and why?
According to U=q-w:
i) When work is done BY the gas, energy is lost. "W" is positive.
When work is done ON the gas, energy is gained. "W" is negative.
According to U=q+w:
ii) When work is done BY the gas, energy is lost. "W" is Negative.
When work is done ON the gas, energy is gained. "W" is positive.
*I had learned that whenever work is done by a gas, it has lost energy (because it had done work), which would make W negative.
According to U=q-w:
i) When work is done BY the gas, energy is lost. "W" is positive.
When work is done ON the gas, energy is gained. "W" is negative.
According to U=q+w:
ii) When work is done BY the gas, energy is lost. "W" is Negative.
When work is done ON the gas, energy is gained. "W" is positive.
*I had learned that whenever work is done by a gas, it has lost energy (because it had done work), which would make W negative.