Pressure changes are really important when it comes to how energy moves during phase changes. I’ve seen this firsthand in my chemistry class.

1. Boiling Point:

• The boiling point of a liquid is affected by pressure.
• When the pressure is higher, the boiling point goes up. This means you need more energy to turn the liquid into gas.
• It’s like how water boils at a hotter temperature in a pressure cooker—because it needs more energy!

2. Melting Point:

• Just like boiling points, higher pressure can make the melting point of solids go up.
• For example, when ice is under a lot of pressure, it can melt at lower temperatures. This is important for understanding how glaciers melt.

3. Energy Going In or Out:

• When things change from solid to liquid or from liquid to gas, they either take in energy or give it off. This is often called latent heat.
• For instance, when ice melts, it takes in energy but doesn't change its temperature. This process is key to figuring out how energy works in our atmosphere and climate.

So, changes in pressure can really affect how easily substances change form and the energy needed for those changes!