Because the air that you breathe out has already been warmed while it was inside your body and it passes that warmth on to your hands.
The woman is feeling her hands getting warmer due to the transfer of heat energy from the hot cocoa to her hands. This transfer of heat occurs because of the temperature difference between the hot cocoa and her hands, resulting in her hands absorbing the heat from the cocoa.
The warmth that you feel when rubbing your hands comes from the friction generated between your hands. When you rub your hands together, the energy from the motion is converted into heat, warming up your hands.
Rubbing your hands together generates friction, which creates heat. This can be useful for warming up your hands on a cold day.
When you cause friction, the kinetic energy from the rubbing motion is converted into heat energy. This increase in heat energy warms up your hands as they come into contact with each other or with another surface.
As you warm up by the campfire, the heat causes the molecules in your hands to vibrate more rapidly. This increased molecular motion leads to the sensation of warmth that you feel. The heat energy from the fire is being transferred to your hands, causing the molecules in your skin to move faster.
To stop it from blowing up.
i can heat up stuff with my hands
Car heaters need a few moments to warm up.
heat and a/c barley blowing in back?
Car not blowing air or heat
because the flesh on your hands then heat up the air
dynamite is used for blowing things unwanted up. if its put in the wrong hands it can be very dangerous.
dynamite is used for blowing things unwanted up. if its put in the wrong hands it can be very dangerous.
friction
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
The air you blow is about 30C, if your hands are cold, their temperature will be lower than that, therefore, blowing 30 C on them will warm them up. If your food is too hot, it is above 30C (can go as high as 100C or more), blowing 30C on them will cool the food faster.
Ask this question again. Is the question no blowing or blowing cold?