2.
Give reasons for the following:
(a) Cooking utensils are made of metals.
(b) Pressure cooker is provided with bakelite handle
(c) Chimneys are fitted in factories.
(d) Rooms are provided with ventilators and exhaust fans.
(e) The containers of solar cooker are painted black
Answers
Answer:
a) The 'Cooking utensils' are mostly made by metals because; They are very 'good conductors' of heat and helps food to cook faster. They are highly heat resistant and can withstand heat while cooking without melting or softening of the metal .
b) Bakelite is a special material that is used for its ability to resist heat. Bakelite does not conduct heat well, which makes it the perfect material for creating pressure cooker handles.
c) Long chimneys take the harmful smoke and gases produced in the factories high up in the air so as to reduce its harmful effects on the ground.
d) Rooms are provided with ventilators and exhaust fans near the top sidewalls because the air we breathe out is hot and stale which means that is is of low pressure, the winds blowing from the exhaust fans or the ventilators have fresh air, which is higher in pressure so it blows downwards.
e) Black color is a good heat absorbent. Hence when the solar cooker painted by black color it can absorb more heat energy and also keep it does not allow the heat to escape outside. There by it rapidly increase the heat inside the cooker. That will help the cooking to more easily.
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