Always. Solids, liquids, and gases should be wafted.
The correct method to test the odor of an unknown chemical is to waft the vapor towards your nose using a piece of paper. This helps to prevent inhaling a concentrated amount of the chemical. Avoid directly sniffing the chemical as it may be harmful.
I assume you mean motion. You should always waft something towards your nose. This helps to dilute the smell, and you really want to do this if it is something really smelly like triethylamine, really dangerous like dimethylformamide or conc acid or if it'll make you light headed, i.e. chloroform. I'm speaking from experience on the latter.
Sometimes you have to smell things in labs. It is very dangerous to stick your nose over a test tube and sniff it so you have to waft it. You do this by holding the test tube or beaker away from you face and wave your hand over it trying to wave the smell towards your nose.
"Wafting" is the method for detecting the odor of chemicals safely. It is taking a palm of the hand and circling it rapidly over the substance. A lower concentration of vapors should be inhaled.
It mean that you take whatever you are supposed to smell and wave your hand over it and towards your face rather than sticking your nose directly over what you are smelling.
You should waft so that the fumes don't go directly through your nose. You could have some of the dangerous side effects.
Gently and carefully waft the vapors of the chemical toward one's nose.
WAFT
The smell began to waft into the room.He used the magazine to waft the stench away from him.A waft of cold air suddenly invaded the building.
Get me a fan, I need to waft some cool air on myself.A waft of air came from the kitchen and breakfast smelt delicious.The flag would waft softly in the breeze.
To waft means to carry lightly and smoothly thru the air.
The slaves continued to waft far away from their masters
A waft test may help in distinguishing between the salts only by their smell.
The waft of cold win felt good on a hot summer day.
You should waft so that the fumes don't go directly through your nose. You could have some of the dangerous side effects.
The fragrance of the kabab wafted through the streets of India. This is an example sentence of the word waft.
say it wahft