Why is the 3 test tubes in the same diameter doesn't have same level of water using a dropper?
Answer:
possibly because good chemistry glassware is hand blown. as test tubes are not calibrated there should be a slight difference. Test tubes are not used to measure volume. Because they aren't used to determine volume, they act merely as vessels, there is no need for precise calibration. For example take 3 1L flasks side by side. Because they are precisely calibrated you will notice the "fill line" etched into the glass of the 3 are at varying levels on the top of the neck. They have been calibrated. Test tubes aren't because you add measured amounts to them. Not the other way around.
excess water in tubes? dropper inaccurate? you cant drop droplets of water for crap?
The glass might be a different thickness or the bottom of the tube might have a different curvature. Your drops are most likely inconsistent.
I really don't understand your question but my best guess would be that (assuming your filling 3 tubes with a dropper) maybe some of your drops went down the side of the tube and stuck there as water tends to do. If you drop the water in EXACTLY down the middle so it doesnt stick to the side all 3 should have the same volume.
It's just the size of the water drops - look at them and you can see that they are not all EXACTLY the same size. So after you put enough in, eventually you will be able to see a difference in the water levels of three tubes. I think you need to use a technique in which you give just enough pressure for the drop to release, each time you are making the drop, to correct that.
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