The statement 'Wet gases will expand more than dry gases' is:

The statement 'Wet gases will expand more than dry gases' is:

• A. True
• B. False
• C. Not determinable
• D. Only at high temperatures

Answer: (A)

The key idea is that how much a gas expands is tied to how many gas particles (moles) are present, via PV = nRT. When a gas is wet, water vapor adds more molecules to the mix. For the same pressure and temperature, more moles mean a larger volume, so a wet (humid) gas will occupy more space and thus expand more than a dry gas under the same conditions. This holds best when the water vapor stays in the gaseous form; if humidity condenses, the number of gas moles would drop and the expansion advantage would disappear. In short, adding water vapor increases the total amount of gas particles, leading to greater expansion at the same P and T.

The key idea is that how much a gas expands is tied to how many gas particles (moles) are present, via PV = nRT. When a gas is wet, water vapor adds more molecules to the mix. For the same pressure and temperature, more moles mean a larger volume, so a wet (humid) gas will occupy more space and thus expand more than a dry gas under the same conditions. This holds best when the water vapor stays in the gaseous form; if humidity condenses, the number of gas moles would drop and the expansion advantage would disappear. In short, adding water vapor increases the total amount of gas particles, leading to greater expansion at the same P and T.