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CBSE Class 7 Answered

What is maximum and minimum thermometer ? how it is used ?

Asked by akritisingh032009 | 18 May, 2021, 07:25: PM
Expert Answer
A maximum–minimum thermometer is used to measure the daily temperatures in order to prepare weather reports. 
It is also known as Six’s thermometer, by the name of its inventor James Six in 1782 and it is used in meteorology and horticulture
 
How to use? - 
 
  • It has a U-shaped tube with two separate temperature readings i.e. one for the maximum temperature and one for minimum temperature.
  • One bulb, fixed at the top of the arm contains alcohol and the other bulb contains a vacuum or low pressure alcohol vapour. 
  • The alcohol measures the temperature and the mercury indicates the temperature reading on both the scales.
  • As the temperature rises, the alcohol in the bulb A expands and pushes the mercury below it such that the mercury rises in the other arm.
  • When the temperature falls, the alcohol in the bulb A contracts and the mercury moves towards bulb A. 
  • As the mercury moves towards bulb A or B, it pushes two small steel markers inside the tube which can be reset by using a small magnet.
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