What are pressure-induced phase transitions?

Pressure-induced phase transitions are when materials change their form because you squeeze them really hard, like squishing a toothpaste tube until it changes shape.

Imagine you have a block of ice in your freezer. It’s solid and cold. Now imagine you put that ice into a super strong container, then press down on the top with all your might, or even more than that! The ice gets squeezed so hard that it starts to melt, but not because it got warm. Instead, it changed from solid to liquid just because of pressure.

Think about a sponge. When you squeeze it, water comes out. A material under high pressure might act like that sponge. The way its tiny building blocks (called atoms or molecules) are arranged changes, and this makes the whole thing behave differently. It might become softer, melt, or even turn into something else entirely.

Deep inside Earth’s mantle, rocks get squeezed by tons of pressure, and they can change from one form to another. This is why scientists know that pressure-induced phase transitions are not just a cool idea, they’re happening all around us!