Can someone please help me answer this questions !!

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

What is the equation for electrical work?