Question

As altitude increases, the air pressure decreases. How do you think the lower pressure will affect the following?.

Answer 1

A. Freezing point: Increase.

B. Melting point: Decrease

C. Boiling point: Decrease​

Step-by-step explanation:

As we go up in higher altitudes the air becomes on and less dense, hence the decrease in the water vapor content at such altitude leads to a decrease of boiling point.

Thus the air above is cool and much colder than at the ground surface. The vapor pressure is temperature-dependent and thus the melting point will decrease.