You know, when liquid is hot, particles in it are moving fast. This is what makes it hot. It has energy, I think. But, cold liquid, particles in it are moving slow, but what make it cold? you know, solid objects have a particles that don't move after all. But it's not cold. What makes cold liquid or ice make us feel cold?
Sorry for bad English.
Sorry for bad English.
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Well, hot liquids are hot because their molecules contain a great deal of kinetic energy, transferring it to any object that is cooler than them. Thus, when you touch a hot liquid, the molecules transfer their energy onto the molecules that constitute your hand, which in turn makes the molecules in/on your hand move more quickly. The nerves in your hand sense this, and tell you that it is 'hot' via the brain. On the other hand, when something is (much) colder than your hand, the molecules of that liquid are moving much more slowly, and will absorb any kinetic energy from objects that are warmer than the liquid. Hence, as your warm hand touches a colder liquid, the molecules in/on your hand transfer their kinetic energy to the colder liquid. As a result, there is an energy transfer from your hand to the liquid, the nerves sense this, and your brain interprets this as losing kinetic energy from the molecules in your hand, or rather, you feel 'colder'.