A bimetallic strip thermometer is a mechanical thermometer that is commonly used for its temperature control. This type of thermometer is robust, simple and has a wide temperature range. It contains two strips that are bonded together and made of dissimilar metals.Continue Reading
The strips have a fixed end and a free end. The principle behind the mechanism of a bimetallic thermometer is that the pair of strips bend at the free end when the temperature changes, and one of the strips expands more than the other. Bimetallic strips typically use a low thermal expansion alloy, such as Invar, and a high thermal expansion alloy, such as steel or stainless steel.
Bimetallic strip thermometers are constructed in two ways. The first method is a spiral strip, which involves coiling the bimetallic strip into a spiral that is attached to a dial that shows the temperature. The second method of constructing this thermometer is through a cantilever strip, which uses deflection to indicate temperature. The bimetallic strips are closely bonded together in a cantilever.
Bimetallic thermometers are often used to measure and control temperature in thermostats. The main advantage of using bimetallic strips is that a power source is not necessary. Moreover, they are sturdy, affordable and easy to use. However, they are not quite exact, and they do not function well at very low temperatures. Also, they cannot be used in applications where manual reading is not acceptable.Learn more about Measurements
Calibrate a thermometer by filling a container with finely crushed ice and water, stirring the mixture and immersing the stem of the thermometer at least 2 inches into the water without touching the sides or bottom of the container. If you are calibrating a food thermometer, adjust the nut under the dial so the unit reads 32 degrees Fahrenheit without removing the probe from the ice water. These methods help to verify the accuracy of food and other thermometers.Full Answer >
While the majority of thermometer manufacturers no longer make mercury thermometers as of March 2015, a few manufacturers still produce them for industrial or laboratory use. Many states, including California, Massachusetts and Washington, have passed laws to limit the manufacture or sale of mercury thermometers.Full Answer >
Measurements play an important role in daily life because they are useful to do basic tasks, such as take a child's temperature with a thermometer, make time estimations, measure out medicine and find weights, areas and volumes of different materials or substances. For examples, people use measurements in simple home task like cooking where one may need to use a weighing scale or read the temperature of an oven when baking foods.Full Answer >
A thermometer measures the temperature of things. "Thermo" means heat, and "meter" means to measure. A thermometer is capable of measuring the temperature of a wide range of objects and the temperatures of individuals. These measurements include body temperature, oven temperature and outside temperature.Full Answer >