Glass Thermometer, Red Spirit Filled, Yellow Back, Size 150mm -10°C to 110°C

Description

The Glass Thermometer, Red Spirit Filled, Yellow Back, also known as a red spirit laboratory thermometer, mercury-free glass thermometer or liquid-in-glass thermometer, is designed for measuring temperature during general laboratory procedures, scientific experiments and educational activities. This laboratory thermometer features a red spirit-filled glass tube with a yellow-backed scale, providing a clear visual contrast between the temperature-indicating liquid and graduated markings. The -10°C to 110°C measurement range supports temperature observations across a variety of laboratory conditions, including suitable experiments involving chilled liquids, ambient temperatures and heated solutions. Its compact 150 mm length makes the thermometer convenient for use with smaller laboratory vessels where a longer 300 mm instrument may be less practical.

Unlike traditional mercury-filled thermometers, the instrument uses a coloured spirit-based filling. This avoids the use of mercury while retaining the familiar operating principle of a liquid-in-glass thermometer. Temperature measurement relies on the thermal expansion and contraction of the liquid contained within a narrow glass capillary. As the temperature increases, the liquid column rises along the graduated scale. When the temperature decreases, the liquid contracts and the column falls, allowing the user to observe changes in temperature through the position of the liquid. The yellow-backed glass provides a contrasting surface behind the red liquid column, helping users distinguish the temperature indication from the surrounding scale markings.

This design is particularly useful in educational environments where students are learning to read analogue instruments and identify temperature values accurately. The thermometer displays readings in degrees Celsius (°C), the standard temperature unit used in Australian scientific laboratories and educational settings. During use, the sensing bulb should be positioned in the material being measured according to the thermometer’s specified immersion requirements. Allow sufficient time for the reading to stabilise before recording the temperature. The compact design supports general chemistry, physics and introductory thermal science experiments, including investigations of heating, cooling and temperature changes in compatible laboratory liquids. Students can use the thermometer to explore heat transfer, thermal equilibrium and liquid expansion, connecting theoretical concepts with observable changes in the temperature-indicating column.

It can also assist with routine temperature observations during solution preparation, laboratory demonstrations and educational sample testing, provided the measurement range and chemical compatibility are appropriate. The glass construction allows users to observe the liquid column directly. However, the thermometer must be handled carefully to avoid breakage or separation of the liquid column. Because it uses a liquid-in-glass measuring mechanism, the instrument does not require batteries, digital displays or electrical connections.

Safety Precautions: Do not exceed the stated temperature range or expose the thermometer to direct flames. Avoid thermal shock, impacts and contact with incompatible chemicals. Use a suitable holder where necessary. If the glass breaks, prevent direct contact with the filling liquid and follow laboratory spill procedures. The thermometer’s graduation interval, measurement accuracy, immersion type and calibration status have not been confirmed for this specific 150 mm red spirit, yellow-back configuration.

LabChoice Australia supplies glass laboratory thermometers and temperature measurement equipment for schools, universities, research laboratories and scientific facilities across Australia.