Physics

What is the normal pressure of the atmosphere? The normal pressure is equal to the pressure of 76 cm mercury column.

What is barometer? Barometer is an instrument which is used to measure air pressure.

Which bulb will glow brighter between 100 W and 60W – Explain. The 100 W bulb will glow brighter than the other one. Power of any electric device represents the amount of energy transfered into any other energy from electric energy in unit time. 100 W power is greater than 60 W power, as a … Read more

Why people don’t get drowned on the dead sea? Whether a substance floats or gets drowned, that depends on the density of that substance and density of water. In the dead sea, the density of water is so much, as the mixture of salt and other substances. That’s why people don’t get drowned in the … Read more

Why gas filled balloon goes up easily? Gas filled balloons are mainly filled with Hydrogen gas or any light gas. Density of hydrogen gas is very much less than air. That’s why these balloons go up easily.

What do you mean by buoyancy? Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. If a substance gets drowned in a fluid, its weight seems to be lost. This happens due to buoyancy that acts opposite to the weight of the object.

Why does atmospheric pressure reduce as water vapour in air increases? Water vapour is lighter than air, that’s why atmospheric pressure reduces as water vapor in air increases. Water vapour goes up while cooking. From this, we can assume, water vapour’s density is less than air. That’s why, as water vapor increases, the average density … Read more

Describe the change in melting point of an object due to pressure. Variation of pressure on an object has effects on changing the melting point. This can happen in two ways? 1) The substances whose volume reduces while converting from solid to liquid (like ice), their melting point reduces as the pressure increases. They get … Read more