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प्रश्न
Give reason for the following observation :
The smell of hot sizzling food reaches us even from a considerable distance but to get the smell from cold food, we have to go close to it.
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उत्तर
The aroma of hot, sizzling food reaches us very easily even when we are far away from it, but the aroma of cold food reaches us only when we are near it because the rate of diffusion of a hot gas is faster than cold gas. When the gas is hot, the particles have greater kinetic energy and they move faster; therefore, they have a higher rate of diffusion.
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संबंधित प्रश्न
Comment upon the following:
rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.
Give a reason for the following observation.
We can get the smell of perfume sitting several metres away.
If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.
State two characteristic properties of a gas.
Why do gases have neither a fixed shape nor a fixed volume?
Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :
When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?
______ is not affected by gravity.
Comment upon the following:-
compressibility
