A glass hasn't a true melting point. The softening point of Pyrex glass is between 800 °C and 850 °C.
another name for test tube is culture tube or sample tube
It depends on what size test tube you are using.
If a test tube is clean and dry, then there should be nothing in it.
You first get a bowl of tap water, get a test tube with the argon in it. Take out the cork screw out of the test tube. Get a splint put it over the test tube when you open it and it it pops that means it is a metal
It is subjective as to whether a test tube baby is immoral or not. Some religions feel that it is.
Pyrex is resistant to thermal shock and can withstand high temperatures, so the surface of the Pyrex test tube likely did not change in the flame. It should remain unaffected under normal laboratory conditions.
In a flame, the surface of a Pyrex test tube may become sooty or blackened due to carbon build-up. This is typically a result of incomplete combustion of the gas or other material being burned. Pyrex glass itself is resistant to high temperatures and is unlikely to melt or deform in a regular flame.
The melting point is independent of the quantity. What changes is the amount of heat which must be supplied.
Try it and you'll find out !
In such cases the melting point determination must be performed in a sealed capillary tube to avoid loss of sample. This can be achieved by heating the open end of the capillary tube, and with tweezers forcing it shut.
A Thiele tube is a simple device used in chemistry for measuring the melting or boiling points of substances. It consists of a capillary tube attached to a thermometer and is immersed in the substance being tested. Changes in temperature are observed to determine the melting or boiling point accurately.
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It is not easy to be cleaned inside.
You can cause damage to them!
FALSE!!
That depends on the size, the type of glass, and if the test tube has an special features - such as threading at the top to allow a screw cap to be screwed on... With that said, a typical price for the test tubes you usually see is around $1/each for a 14 ml Pyrex test tube. I've seen really cheap ones for less than half that when bought in bulk and some specialty ones that were over $5/each.
Because if the experiment being conducted in the test tube is explosive or very reactive then it can spit out stuff and this can be dangerous to your eyes or skin. so by pointing the test tube away then you won't harm anyone if anything spits out