Relentless heat flowing onto an object can transform its state: from ice to water, from water to steam. At first, the temperature raises as atoms vibrate more and more with this sensible heat. They keep fighting against their ordered state. When the temperature is high enough, the energy starts breaking all bonds: atoms can finally escape the chains of order. This heat is called latent because it acts in secret, without changing the temperature: from ice to water, from water to steam.