Put a picture we can’t see the arrow
As the air molecules move through the valve they have friction as they hit the walls, and its this friction that causes it to heat up.
Answer:
All ions must a overall charge
Explanation:
Answer:
Energy was released
Explanation:
Decrease in temperature means less energy, but the energy had to have been transferred because energy can't be destroyed or created. So if the temp. went down, energy must have been lost. (If it had been absorbed, the temp. would have gone up)
