Are “odor molecules” different from an actual molecule?


An odor is the property of substances that stimulate the sensory system. And it is a physical property.

Whenever we smell something, our nose and brain work together to make sense of hundreds of very tiny invisible particles, known as molecules or chemicals, that are floating in the air. If we sniff, more of these molecules can reach the roof of our nostrils and it is easier to smell.


The fact that we have two nostrils allows our brain to detect small differences in the number of molecules that reach each one.

The sense of smell relies on your nose’s recognition of tiny particles in the air called odorants. 

Odorant particles are released from their source for many different reasons. 

For example a camphor  is being heated, so many of its molecules will gain extra heat energy that allows them to vaporize and fly into the air.

Here, the density of the molecules will vary for the actual molecules. But these are coming from their actual source.

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