The mixer turns electrical energy into motion, that spinning thing at the bottom. However, it can't turn ALL electrical energy into motion. Some of it turns into heat due to various kinds of friction. And that's the heat you are feeling. If you wanted to run the mixer continuously, that heat would have had to be managed somehow. Maybe with a cooling fan or something.
because friction produces heat
I put hot water in the thermos and let sit for a few minutes until inside gets hot.
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Heat flows from hot to cold because when hot and cold bodies contact with each other (thermal contact), the fast moving molecules of the hot body collide with slow moving molecules of the cold body; therefore the molecules of hot body become slower and body becomes cool, and the molecules of other body (cold) becomes faster and the cold body becomes hot. Notice: when molecules of a body moves faster it's kinetic energy increase therefore temperature increases and it becomes hot.
Heat flows from hot to cold because when hot and cold bodies contact with each other (thermal contact), the fast moving molecules of the hot body collide with slow moving molecules of the cold body; therefore the molecules of hot body become slower and body becomes cool, and the molecules of other body (cold) becomes faster and the cold body becomes hot. Notice: when molecules of a body moves faster it's kinetic energy increase therefore temperature increases and it becomes hot.
because friction produces heat
Is there a mains cold and gravity hot mixer shower on the market?
No.
After running for a few minutes...Need more information?
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I put hot water in the thermos and let sit for a few minutes until inside gets hot.
Below freezing point. After a few minutes, it will turn to milk.
A few minutes into the expansion of the big bang, the temperature was about a billion kelvins
You could, but it's going to be very hot after a few minutes.
leather in the cold does not get hard. when you leave it in the cold for about 30 minutes, it becomes really cold. leather in the sun is still bendable in 30 min. it becomes hot, but not really hot. OK leather in water becomes really floppy and soft. oh yeah it is also really wet after 30 minutes in the water THIS QUESTION IS GOOD FOR SCIENCE STUFF!!!!!!!
A Bristan Thermo Mixer Shower head is specified by its thermal options. It is for both hot or cold water, the hot water is just easier for this type of shower head to be used.
Mixer taps are extremely easy to use and one does not constantly have to try and get the perfect temperature and mixture of hot and cold water. Also one can make sure that hot water is not being overused.