What is Thermometer and its Types

Thermometer and its Types

 

The instrument that is used to measure temperature is called a thermometer.

 

Types of Thermometer

 

  1. Ordinary Liquid-in-Glass Thermometer

 

An ordinary liquid-in-glass Thermometer is used in a laboratory to measure Temperature within a range of -10C To 110C.

 

Construction:

 

It consists of a glass stem with a capillary tube, having a small bulb at one end. This bulb is filled with a liquid, usually mercury or alcohol colored with a red dye. The upper end of the capillary tube is sealed so that the liquid will neither spill not evaporate. The air from the capillary tube is also removed.

 

Working:

 

When the bulb is heated, the liquid in it expands and rises in the tube. A temperature scale is marked on the glass stem to indicate temperatures according to the various levels of liquid in the tube.

 

  1. Clinical Thermometer

 

A clinical Thermometer is a device that is used to find the temperature of the human body. It has a range from 35 C To 43 C (95F To 110F)

 

 

Construction:

 

It consists of a glass stem with a capillary tube, having a small bulb at one end. This bulb is filled with a liquid usually mercury or alcohol colored with a red dye. The upper end of the capillary tube is sealed so that the liquid will neither spill nor evaporate. The air from the capillary tube is also removed. The glass stem of a clinical Thermometer has a construction in its capillary tube near the bulb. This helps to stop the mercury thread from moving back when the thermometer is removed from the patient‘s mouth.

 

Working:

 

In order to find out the temperature, the thermometer is placed in the mouth or in the arm pit of the patient. The liquid in it expands and rises in the tube. A temperature scale is marked on the glass stem to indicate temperatures according to the various levels of liquid in the tube.

 

 

  1. Maximum and Minimum Thermometer

 

This Thermometer is used to read the maximum and minimum temperatures reached over a period of Time.

 

Construction:

This thermometer consists of a fairly large cylindrical bulb with alcohol in it. This bulb is connected through a U-shaped Tube filled mercury. At the end of this U-shaped Tube another bulb containing alcohol is provided.

 

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