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THERMOMETERS: Clinical, Digital-Infrared, Kerosene-Spirit filled, Maximum-Minimum, Suspension clamp, Stand | Range varies from 50°C to 600°C | Ideal for scientific use.

$ 3.80$ 160.00 excl. GST

Thermometers

We supply a wide range of thermometers including kerosene filled, Red-fill (red spirit) and ‘Green fill’ (green kerosene). Various accessories like stand, clamps and infrared type measuring devices are also available too.

Some may arrive with spirit columns separated which can happen to any brand.
Restoration methods are as follows:
1) Stand them vertically (bulb end down) leaving them for a few weeks. (This is the simplest and easiest method)
2) Place them in water and slowly bring it to the boil.
3) Gently heat bulb at base over a spirit lamp flame. This forces the spirit up the column until it gets to the top, eliminating gaps in the spirit column as it moves.

WARNING!
Wear safety goggles and a laboratory coat when doing this. If the liquid is put under pressure at the top, the bulb at the base will burst.
Always store liquid (particularly spirit) types vertically, bulb end down, to avoid the possibility of their columns splitting – recommended by manufacturers of liquid types.

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SKU: THERMOMETERS-CLAMP-&-STAND Categories: , , Brand:

Description

We supply a wide range of thermometers including kerosene filled, Red-fill (red spirit) and ‘Green fill’ (green kerosene). Various accessories like stand, clamps and infrared type measuring devices are also available too.

For other related Heat Related items, click here.


[Wikipedia article]

is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared model). Thermometers are widely used in technology and industry to monitor processes, in meteorology, in medicine, and in scientific research.

Some of the principles of the thermometer were known to Greek philosophers of two thousand years ago. The Italian physician Santorio Santorio (Sanctorius, 1561-1636)[2] is commonly credited with the invention of the first thermometer, but its standardisation was completed through the 17th and 18th centuries.[3][4][5] In the first decades of the 18th century, Daniel Gabriel Fahrenheit made two revolutionary breakthroughs in the history of thermometry. He invented the mercury-in-glass thermometer (first widely used, accurate, practical thermometer)[1] and Fahrenheit scale (first standardized temperature scale to be widely used). These inventions helped usher in the era precision thermometry.

Physical principles of thermometry
Various thermometers from the 19th century.
Comparison of the Celsius and Fahrenheit scales

Thermometers may be described as empirical or absolute. Absolute thermometers are calibrated numerically by the thermodynamic absolute temperature scale. Empirical thermometers are not in general necessarily in exact agreement with absolute thermometers as to their numerical scale readings, but to qualify as thermometers at all they must agree with absolute thermometers and with each other in the following way: given any two bodies isolated in their separate respective thermodynamic equilibrium states, all thermometers agree as to which of the two has the higher temperature, or that the two have equal temperatures.[21]

For any two empirical thermometers, this does not require that the relation between their numerical scale readings be linear, but it does require that relation to be strictly monotonic.[22] This is a fundamental character of temperature and thermometers.[23][24][25]

As it is customarily stated in textbooks, taken alone, the so-called “zeroth law of thermodynamics” fails to deliver this information, but the statement of the zeroth law of thermodynamics by James Serrin in 1977, though rather mathematically abstract, is more informative for thermometry: “Zeroth Law – There exists a topological line M {\displaystyle M} M which serves as a coordinate manifold of material behaviour. The points L {\displaystyle L} L of the manifold M {\displaystyle M} M are called ‘hotness levels’, and M {\displaystyle M} M is called the ‘universal hotness manifold’.”[26]….

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