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Flaming the mouth of a test tube creates an air flow. Hot air rises. Therefore dust/particles in the air are less likely to fall into your tube.
There is some controversy as to the value of this action. The hot air will also create eddy currents across the mouth of the tube or flask which may actually increase the opportunity for contamination. If there is some data which supports either view, I would like to see it. In my opinion, the reason behind flaming the mouth of a test tube has not been proven, it is just taken to be dogma.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoThe purpose of flaming the test tube when putting in or out microbes is to prevent
contamination of its content which could normally comes from the ambient air.
Wiki User
∙ 10y agoThis actually sterilizes the mouth of the test tube. It is a back up to prevent contamination.
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What happened when you place a lighted match near the mouth of the test tube?
It depends on what is inside the test tube. If the test tube is empty nothing will happen, if there is petrol in the test tube the petrol will ignite.
In heating chemicals in a test tube where should the mouth of the test tube point?
Away from you....... BULOK eat my dust
What are two safety rules you should follow when heating liquid in test tubes during an investigation?
1) Hold the test tube using test tube holders. 2) Keep your face and hands away from the mouth of the test tube as vapours (if any) can be harmful and sometimes may cause burns.
Why substance stick to the test tube?
The ability of a substance to stick on inside part of a test tube depends on its surface tension, that's why substances such as water can stick to a window. And the other reason for sticking of a substance to the test tube could be that the test tube itself is dirty, thus the dirt particles hold the substance in place.
What happens when a burning matchstick is brought near the mouth of test tube in which a metal has reacted with sulfuric acid?
hgytdemu
What happens to gas that is more dense than air in a test tube mouth up and mouth down?
Test tube mouth up: nothingTest tube mouth down: the denser gas can escape
What happen when you placed a lighted match near the mouth of the test tube?
It depends on what is inside the test tube. If the test tube is empty nothing will happen, if there is petrol in the test tube the petrol will ignite.
What happens when you place a lighted match near the mouth of the test tube?
It depends on what is inside the test tube. If the test tube is empty nothing will happen, if there is petrol in the test tube the petrol will ignite.
What happened when you place a lighted match near the mouth of the test tube?
It depends on what is inside the test tube. If the test tube is empty nothing will happen, if there is petrol in the test tube the petrol will ignite.
What happens when you place a lighted match near the mouth of the tube?
It depends on what is inside the test tube. If the test tube is empty nothing will happen, if there is petrol in the test tube the petrol will ignite.
In heating chemicals in a test tube where should the mouth of the test tube point?
Away from you....... BULOK eat my dust
What is the process by which ammonia gas is produce at the bottom of the test tube comes in contact with the litmus paper at the mouth of the test tube?
By Diffusion.........
When you are heating materials in a test tube what is very important about the mouth of the test tube?
The most important aspect of heating liquids in a test tube is to never look directly into the mouth of the test tube, as liquid may spurt out and come into contact with your eyes or face. However, if you are wearing plastic safety glasses, the substance may not harm you, depending on the type of substance you are heating.
Placing the test tube holder near the mouth of test tube?
Like this: http://www.haines.com.au/Gee_Store/ProdImages/300-test%20tube%20holder.jpgIt just means to hold it by the top, not the bottom.
What happens when a piece of Mg ribbon is place in a test tube with Hydrochloric acid and cover the mouth of the test tube?
Metal + Acid --> Salt + Hydrogen Gas. As a result, the end product of this reaction is magnesium chloride and hydrogen gas. Covering the mouth of the test tube simply prevents the hydrogen gas from escaping, and allows you to test for its presence by using a lighted splint.
What is the material used to hold test tubes?
A boiling tube is used for boiling a liquid in
Why is flaming the neck of the tubes immediately after uncapping and before recapping is essential during subculturing?
Flaming sterilises the tube.
