Question

give reasons for the following observation :
the smell of hot sizzling food reach you several metres away but to get smell from cold food you have to close

Answer 1

Such kind of conditions happen because the gaseous molecules of hot sizzling food have a huge intermolecular space which makes them easy to move in a large area in less time.

Answer 2

Statement:

The smell of hot sizzling food reach you several meters away but to get smell from cold food you have to  be close.

Reason:

Smell normally comes only through air. So when the food is hot, vapor is produced and it gets diffused easily in the air and is spread easily in the surroundings.

Whereas, no vapor is present in cold food, which why the smell is not spread in the surroundings by cold food.