What is wafting method?
In “wafting” a person takes an open hand with the palm towards the body and moves their hand over the substance in a gentle circular motion so as to lift vapors of the substance towards the nose. …
Why do we smell ester by wafting?
Wafting is more safer method to smelling the dangerous and unpleasant chemicals ,also it helps in inhaling the low concentration vapours .
What is the procedure for smelling a chemical?
When you are in the laboratory and take a direct sniff of the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When it is necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air toward your face.
When pouring chemicals reagents you should?
When performing a dilution, never pour water into concentrated reagents (always pour the reagent into the water). 21. If you spill a chemical reagent on yourself, immediately flood the exposed area with water, then summon the laboratory instructor (inform the instructor immediately about any other accidents or spills).
What is wafting gas Class 10?
Those gases which stays lightly over water are called wafting gas. These gases are harmful for people leaving in coastal areas. They are mainly released from industries and cause breathlessness.
What is wafting gas?
Those gases which stays lightly over water are called wafting gas. These gases are harmful for people leaving in coastal areas. They are mainly released from industries and cause breathlessness. They are often colourless with pungent smell.
When testing for odors use a wafting motion?
Detecting an odor in a laboratory is best done using the technique of wafting. Wafting involves drawing one’s hand across the opening of a container in order to push the odor towards the nose (see Figure 1). If the odor is undesirable or dangerous, the person can move his or her face away.
What happens if you smell a chemical?
Exposure to odors could result in health effects ranging from none, to mild discomfort, to more serious symptoms. Some chemicals with strong odors may cause eye, nose, throat or lung irritation. Strong odors may cause some people to feel a burning sensation that leads to coughing, wheezing or other breathing problems.
Why is it important to commit when pouring a liquid?
If you are tentative, the liquid runs down the side of the vessel from which you are pouring and dribbles all over the place. But if you “commit to the pour” and tilt the glass over further, with confidence, the liquid pours into the other glass with no spilling. It never makes it to the other glass.
Why should you hold a bottle with your hand over the label?
When pouring liquid reagents from bottles, hold the bottle with the label against the palm of your hand so that the liquid is poured from the side opposite the label (if any liquid runs down the outside of the label, immediately wipe off the liquid).