IM me at Chriso1281 .
Hot water is heavier than cold water.
In cold water, there are H bonds, which keep a rigid structure, which means that the individual water molecules are a fixed distance apart. In hot water, the H bonds don't keep them at a fixed distance, so more molecules could fit in a given space. Therefore, there are more water molecules per unit space, making it heavier. Thank you, Jon, for clearing that up. You're all wrong.