What are the two types of bimetallic strip?
They are available in two forms helical and spiral form. Where helical bimetallic strip thermometer is used in industrial areas, and the spiral bimetallic thermometer is used in less sensitive areas.
What are the two uses of bimetallic strip?
Usually steel and copper, or in some cases steel and brass is used in bimetallic strip. Two applications are: Used in fire alarms. Used in mechanical clocks to remove the error caused by temperature change.
How does a bimetallic strip measure temperature?
Bimetal thermometers work on the principle that different metals expand at different rates as they are heated. By using two strips of different metals in a thermometer, the movement of the strips correlates to temperature and can be indicated along a scale. Bimetal thermometers are inexpensive, simple, and durable.
What does bimetallic strip measure?
In bimetallic strip thermometers the different rates of expansion of metals when heated is used to measure the temperature! Due to their metallic materials, bimetallic thermometers can be used at temperatures from below -100 °C to more than 500 °C.
Why bimetallic strip is used?
A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated.
Why is mercury used in thermometer?
Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it’s used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.
What happens when bimetallic strip is heated?
The strip of bimetal comprises two metals with different coefficients of thermal expansion. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. Thus they bend towards the metal having a lower thermal expansion.
Why bimetallic strip is used in thermometer?
A bimetallic thermometer is a temperature measurement device. It converts the media’s temperature into mechanical displacement using a bimetallic strip. They are a simple, durable, and cost-efficient way of temperature measurement.
Where are bimetal strips used?
The bimetallic strip consists of two different metals having different coefficients of thermal expansion. Bimetallic thermometers are used in residential devices like air conditioners, ovens, and industrial devices like heaters, hot wires, refineries, etc.
What is called bimetallic strip?
Why alcohol is used in thermometer?
Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. If it freezes it won’t move in the tube, so a liquid must be used that has a freezing point that’s lower than the temperature it’s measuring.
What is mercury barometer?
A mercury barometer is a barometer with a column of mercury whose height varies according to the atmospheric (barometric) pressure. A barometer is an instrument for measuring atmospheric pressure, which is used in forecasting the weather.