The legendary method of measuring sapphire glass by dripping water is to drop a small drop of water on the surface of the glass to be tested. If the water droplets are obviously high in the shape of beads, then it is sapphire glass; if the water droplets spread out, then it is not sapphire glass. Any liquid thing, a small drop on a smooth medium surface, will have different liquid level, this specific situation is related to the nature of the medium and temperature, called liquid tension, also used to calculate the angle, including The watch oil for watches also has this technical indicator. It is the reason why the density and specific gravity of sapphire are relatively large and the surface is smoother and more delicate.
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