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 Lot of 3 - 5R4 - Tubes - 2 Brown Base US $9.99 
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 Tung-Sol 5881 - Brown Base Tube US $9.99
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 1x EL34 6CA7 PHILIPS xF4 TUBE DD-GETTER BROWN BASE NOS US $5.00
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 RCA 801 A - Brown Base Tube - Strong US $9.99
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How can I work out the volume of this test tube?
A test tube has a hemispherical base and straight parallel sides. If the glass it is made from is of negligible thickness how much liquid could it hold?
The test tube has a height of 12cm and a diameter of 2cm.
volume of hemisphere is 2.09 as the formula is (2/3)πr³
volume of a cylinder is V = πr2h so the volume is 34.57
add the two together and you get 36.66 (working to 2dp)
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