Suggest why
a) the base of a saucepan is made of metal
b) the handle of a saucepan is made of plastic
c) polar bears have a thick coat of fur.
d) birds fluff out their feathers in winter
Answers
Answer:
a Metal pots are made from a narrow range of metals because pots and pans .need to conduct heat well, but also need to be chemically unreactive so that they do not alter the flavor of the food. Most materials that are conductive enough to heat evenly are too reactive to use in food preparation.........
b .The handles of frying pans are made of plastic or insulating materials because plastic and insulating materials doesn't allow the heat to flow from pans to handles so that it will be easy to hold the frying pans......
c .To stay warm, polar bears have two layers of fur. The hairs of the outer coat are hollow, increasing their insulating ability. They also have a thick, warm coat of fur below the outer coat. Underneath their fur polar bears have black skin which helps absorb heat......
d .A bird's body heat warms the air between its feathers,” Marra explains. “So birds fluff up in the cold to trap as much air in their feathers as possible. The more trapped air, the warmer the bird...
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Answer:
1.Metal pots are made from a narrow range of metals because pots and pans need to conduct heat well, but also need to be chemically unreactive so that they do not alter the flavor of the food. Most materials that are conductive enough to heat evenly are too reactive to use in food preparation.
2.The handles of frying pans are made of plastic or insulating materials because plastic and insulating materials doesn't allow the heat to flow from pans to handles so that it will be easy to hold the frying pans.
3.Except for the tip of the nose, polar bears are entirely covered in fur. They have a very thick undercoat, which is even denser than the coats of other bears, as well as longer guard hairs. This insulates them from the cold, even when they are in water.
4.“A bird's body heat warms the air between its feathers,” Marra explains. “So birds fluff up in the cold to trap as much air in their feathers as possible. The more trapped air, the warmer the bird.”