The heat is to make it feel better. The ice is to take down swelling. The standard advice is RICE: rest, ice, compression (like an Ace bandage), elevation (prop it up with some pillows etc, or rest with the injured area above your heart). Heat will relax a muscle spasm, cramps, or pulled muscle but won't help with healing a sprain or tear.
It's best to switch off heating and icing shin splints.
butter
Once the cake has cooled and has no heat radiating from it at all. Then the icing will go on the cake easier and better.
That really depends on what you are trying to heat and how you are heating it.
Any sealed container that is exposed to high heat can explode. Unopened cans and jars should never be heated. They need to be opened before heating.
The reason one should stop heating the solution before the liquid has completely evaporated is because heat will continue to carry over even after it is removed from the flame. This means that the liquid will continue to evaporate for a little longer.
The temp is the heat so it can't be hotter than the heat :)
Heating cables come under quite a few different names but are essentially the same product. They can be called heat tapes or heat tracing tapes, self regulating cables or roof and gutter de-icing cables. They should be purchased, whatever the name, from a specialist to ensure that they meet building and health and safety standars such as the Ice Dam company who will also install them for you.
Heating vents should be placed on or near the floor because heat rises. In rising, it will warm the air of the room. If the heating vent were near the ceiling, the room would stay chilly, even though heat was being poured into it.
During an emergency. i.e. when the heat pump is not working. If your heat pump can not keep your house warm, then the auxiliary heating coils (same thing as emergency heat) will come on automatically. If not, then there is a problem with your heating system.
Heating vents should be located near the floor since hot air rises. If the heating vents are located near the ceiling the heat would stay there and not warm the room.
Heating vents should be placed near or on the floor in a room because heat travels up not down.