During the Galaxy S7 announcement Samsung was pumped to show off the device's liquid cooling. This "liquid cooling" works by wicking vapor as the phone heats up. This is a measure taken by Samsung to keep the phone from overheating during high intensity processes.
A recent teardown of the device reveals that the "Liquid cooling" system doesn't actually contain any heat. The pipe contains a liquid gas. Once pressure is released the liquid reverts back to being a gas. When you open the pipe the gas escapes. Whether it should be called liquid cooling or not doesn't really matter to me. Whether or not this works is what matters to me.
via XDA