How can hot water be frozen - where does this happen?
Frozen water expands, while other frozen liquids contract.
It is a true statement that frozen water melts. As ice or frozen water rises in temperature, it will slowly change into a liquid state. It would be false to say otherwise.
the theoretical freezing point of water remains 0°C whether it is already frozen (ice) or liquid form (water) or gaseous (water vapour).
Yes. because it generates friction.
yes!
Mars is hot so frozen water can melt in Mars.
The water is probably frozen in the pipe
No. Both can freeze.
It evaporates. No matter if the water is cold, frozen, or even hot it evaporates.
You probably have a blocked or frozen pipe into the H/W tank.
yes
no wth, just take the frozen food out of the freezer
sit it in some hot water
Slow warm up using warm (not hot)water in a hot water bottle wrapped in a towel in any case.
Yes, water is unique in that it is the only substance that expands when frozen. Therefore ice will be less dense in terms of water molecules than room temperature water or heated water
yes any pipe will
Do NOT pour hot water on a frozen car door, your window will definitely not make it! Cold window in frozen car door+hot water=broken window. Try taking your ice scraper and actually prying the door along the seal to get it to pop open.