Question

give reason : the smell of hot sizzling food reaches you at distance but to get the smell of old food you have to go near

Answer 1

in the hot sizzling food diffusion take faster on heating and in cold food the diffusion is slower as compared to hot food that's why the hot sizzling food reaches you at distance but to get the smell of cold food you have to go near

Answer 2

The smell of hot sizzling food because the molecules have high kinetic energy and hence, they diffuse with the surrounding air quickly and easily.
But the molecules in the smell of old food has low kinetic energy because it's cold and so, it cannot diffuse with the surrounding air easily.