Betekenis van:
test tube

Voorbeeldzinnen

1. 5. When the reaction is over, place the test-tube on a damp cloth.
2. If you leave them lying on the desk they may roll off, so stand them in the test-tube rack.
3. Test tube racks for baths
4. Test tube stand for shakers
5. Operation test of the (gas-tube) pressure relief valve
6. Transfer about 10 ml of this extract to a test tube fitted with stopper.
7. Dilute 1 ml of the solution with 1 ml of water in a small test tube.
8. The test substance must not dissolve noticeably in, or react with, the U-tube fluid.
9. Test portion Weigh 2,00 ± 0,001 g of test sample into a centrifuge tube (6.2) or suitable stoppered flask (50 ml).
10. Incline the test tube, and carefully introduce down the side of the tube 2 ml of sulphuric acid so that it forms a lower layer.
11. The test substance must not dissolve noticeably in, or react with, the U-tube fluid. A pressure gauge can be used instead of a U-tube (figure 3b).
12. Weigh 1,0 g of the sample to the nearest 0,1g and transfer it into the test tube (4.3).
13. The chosen test portion (6.3) is weighed into a centrifuge tube (5.3) and 50 ml 40 % ethanol (4.1) is added.
14. Heat a few drops of the sample in a test tube with about 0,5 g of potassium bisulphate.
15. Place 10 ml of this solution in a test tube (4.6) and add 10 ml of molybdovanadate reagent (3.6).