Liquid Thermometer

The liquid thermometer is the one in which there is liquid filled in the capillary. This liquid rises when in contact with an object, the rise in the level of thermometer liquid shows the temperature of that object.

A thermometer features a glass tube sealed at both ends and is partly crammed with liquid-like mercury or alcohol. As the temperature around the thermometer’s bulb heats up, the liquid rises within the glass tube.

When it’s hot, the liquid inside the thermometer will expand and rise within the tube.
Thermochromic Liquid Crystals (LCs) are often highly temperature-sensitive, change to several colors, and are costlier than dyes. LCs start black below their temperature range, undergo the colors of a rainbow, and back to black again above the temperature range. LCs are reversible in that they can be used over and over again. The picture shows an example of a liquid sheet in response to warming.

Popular liquid Thermometer Applications

Popular liquid applications include medical devices, forehead, aquarium and room thermometers, promotional pieces, and advertising applications. Additionally, functional devices such as propane tank gas level indicator are achieving much notoriety.

Liquid thermometer review strips are getting used for thermal mapping and other industrial applications where custom inexpensive temperature monitoring is warranted. We offer a wide range of liquid crystal thermometers as stock products, but also offer literally thousands of custom products for your label.

LCs are very similar to the liquid crystal displays used in watches and laptop computers, but our thermochromic LCs change color with temperature instead of voltage. LCs can be formulated to change temperature from -22 to +248ºF (-30 to 120ºC), and can be sensitive enough to detect changes as small as 0.2ºF. If kept out of UV light and faraway from high temperatures and powerful solvents, LC products will last for years.

The most prevalent use of liquid is as a self adhesive reversible temperature indicator label that continually monitors temperature offering a visible readout that ranges from traditional numeric displays to custom graphics that can serve as an alert or warning.


These self-adhesive labels contains a series of temperature-sensitive elements containing Microencapsulated Thermochromic liquid (TLC) coated on a black backing. Each element changes color distinctly as its rated temperature is reached, passing through the colours of the spectrum in sequence from tan to green to blue before turning black at a higher temperature).

The TLC strips are calibrated in order that the indicator that shows green indicates the particular temperature. The color changes are reversible and therefore the reflected colors are going to be observed within the reverse order upon cooling.


The temperature-sensitive elements contain TLC molecules that are very sensitive to temperature and alter position / twist in reference to changes in temperature. This change in molecular structure affects the wavelengths of sunshine that are absorbed and reflected by the liquid crystals, leading to a clear change within the color of every temperature event.

When the rated temperature of an indicator is reached the TLC molecules twist slightly causing the TLC substance to soak up the red and blue portions of the light and reflect the green part. This causes the temperature event to appear green. When the temperature decreases, the molecules begin to twist within the other way, and therefore the TLC reflects a special portion of the spectrum.

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