A Beckmann thermometer's length is usually 40 & ndash; 50 cm.
2.
A "'Beckmann thermometer "'is a device used to measure small differences of temperature, but not absolute temperature values.
3.
A later version was built by the French chemist Fran�ois-Marie Raoult, but the difficulty of determining the exact temperature was overcome by the invention of the Beckmann thermometer by Ernst Otto Beckmann in 1887.
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