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Wednesday, April 19, 2017

Cool air from small opening and hot air from wide-open mouth

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If you blow on your hand with your mouth open, your breath will be warm and if you do it with reducing the opening of your lips, your bre...

How do fishes survive in the coldest of winter?

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When ice water freezes to become solid ice, its volume increases and its density is lowered. That’s why ice floats on water. If water wer...

Why does water take longer times to warm than sand?

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Specific heat capacity plays an important role here. It is defined as the amount of heat needed to change the temperature of a unit mass ...

Reason of dropping a coin straight into the glass by removing a card suddenly?

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According to Newton's law of motion, If no external force is applied on a body, a stationary body will remain stationary and a moving...
Friday, December 2, 2016

How is it possible to lie without harm on a bed of nails?

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We know that pressure is a force divided by area over which the force is exerted. When a person lies on a bed of nails, the force equal...
Thursday, December 1, 2016

What is the reason of cooler air coming out of a bursting tire?

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We know from the ideal gas law that pressure increases proportionally with the increase of temperature when volume is held constant for a...
Friday, March 25, 2016

How glass is broken with sound?

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When any object composed of an elastic material is disturbed, it will vibrate at its own special set of frequencies, which together form i...