3 hardest questions from matter chapter. for quiz. class 9. hard plzzz
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1)Why does a desert cooler cool better on a hot dry day?
Ans:A desert cooler cools better on a hot dry day because on a hot dry day temperature is high and humidity is less which helps in better evaporation. Due to the higher rate of evaporation it gives better cooling effect.
2)Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
Ans:the rate of evaporation increases with an increase of surface area in the case of saucer as compared to the cup. so we areable to sip hot tea or milk faster from a saucer rather than a cup .
3) Explain how gases can be liquefied.
Ans:gases can be liquefiedby one of three general methods: 1) By compressing the gas at temperatures less than its critical temperature; ... Thus, it is relatively simple to convert ammonia gas to the liquid state simply by applying sufficient pressure.
Ans:A desert cooler cools better on a hot dry day because on a hot dry day temperature is high and humidity is less which helps in better evaporation. Due to the higher rate of evaporation it gives better cooling effect.
2)Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
Ans:the rate of evaporation increases with an increase of surface area in the case of saucer as compared to the cup. so we areable to sip hot tea or milk faster from a saucer rather than a cup .
3) Explain how gases can be liquefied.
Ans:gases can be liquefiedby one of three general methods: 1) By compressing the gas at temperatures less than its critical temperature; ... Thus, it is relatively simple to convert ammonia gas to the liquid state simply by applying sufficient pressure.
sahil962:
ur questions was good but can u give me more
plzzzzzzz
it is urgent
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