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FLOAT COLD SINK HOT OBJECT

$ 109.20 excl. GST

 

  • This Float Cold Sink Hot studies the effect of temperature on the density of a liquid as a carefully counterweighted 75mm dia. copper ball will just float in cold water but sinks in hot water due to the subtle difference in water density.
  • Is fitted with a stopper to enable ballast weight to be altered.
  • Demonstrates the principle of Galileo’s Thermometer.

In stock (can be backordered)

SKU: TSS32260 Categories: , ,
FLOAT COLD SINK HOT OBJECT
  • This Float Cold Sink Hot studies the effect of temperature on the density of a liquid as a carefully counterweighted 75mm dia. copper ball will just float in cold water but sinks in hot water due to the subtle difference in water density.
  • Is fitted with a stopper to enable ballast weight to be altered.
  • Demonstrates the principle of Galileo’s Thermometer.

(Wikipedia excerpt: …” Galileo thermometer (or Galilean thermometer) is a thermometer made of a sealed glass cylinder containing a clear liquid and several glass vessels of varying density. The individual floats rise or fall in proportion to their respective density and the density of the surrounding liquid as the temperature changes. It is named after Galileo Galilei because he discovered the principle on which this thermometer is based—that the density of a liquid changes in proportion to its temperature.

In the Galileo thermometer, the small glass bulbs are partly filled with different-colored liquids. The composition of these liquids is mainly water; some contain a tiny percent of alcohol, but that is not important for the functioning of the thermometer; they merely function as fixed weights, with their colors denoting given temperatures. Once the hand-blown bulbs have been sealed, their effective densities are adjusted using the metal tags hanging from beneath them.

Any expansion due to the temperature change of the colored liquid and air gap inside the bulbs does not affect the operation of the thermometer, as these materials are sealed inside a glass bulb of approximately fixed size. The clear liquid in which the bulbs are submerged is not water, but some organic compounds (such as ethanol or kerosene) the density of which varies with temperature more than water does. Temperature changes affect the density of the outer clear liquid and this causes the bulbs to rise or sink accordingly..”)

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