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accurate acid amount applied aqua regia atoms calculations called carbon Celsius centimetre Chapter chemical chemistry colour convenient cooled crystal curve definite described developed device electric electric current electron elements engine example experiment extensometer eyepiece fact fairly formula gases gemmologist gemstones glass graph heat human important indicator diagram instrument kind known laboratory length light liquefied liquid load machine magnetic materials mathematical matter means measuring mercury metal method metric system microscope modern necessary needed nowadays object operation pearl pendulum piece pipette possible practical pressure principle properties purposes quantity radiation radiography reader refractive refractive index result sample scale scientific scientific method shown silver simple solution specimen standard stone strength of materials stress structure substances suitable superconductive surface symbol technique thermocouple thermometer things tiny tion tube ultraviolet unit usually vernier scale wavelength weight X-rays