After using the density balance for a period of time, there will be a test error, and there is no problem in weighing the test; replace the liquid. The liquid will deteriorate during use, thus changing the density of the water and changing the test results. The temperature density of pure water at 25 degrees is about 0.99704. For objects close to the water density, liquids with a density lower than water, such as kerosene, etc .; or liquids heavier than water (haha, no suitable ones have been found) density balance Selection, details of use of density balance;
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