With two test tubes you have a spare in case one of the breaks.
You can use a wire instead of the starter to test the tubes .. I did it, it works !
u can't
If the test tubes need to be sterile, you would have to autoclave them.
A group of test tubes are called samples.
85% of 140 test tubes= 85% * 140= 0.85 * 140= 119 test tubes
Bigger, fatter test tubes are usually called boiling tubes.
They are called: - Test tubes - Cultural tubes - Sample tubes
You can purchase test tubes from a science equipment magazine. They will be available in any good stores. Also you can go onto eBay to buy some test tubes.
Test tubes are basically narrow glass tubes used for storing things and performing small chemical reactions in a laboratory. On a lighter note, there are several bars that like to serve certain alcoholic shots in test tubes.
Test tube rack
to test and hold chemicals in
They are used to clean test tubes. :)