Why is absorbance of a bacterial culture an indicator of cell density? Why is mercury used in a barometer? Explain autoclave. How did Antonie van Leeuwenhoek improve the microscope? What are the main differences between aneroid barometers and mercurial barometers?
Mercury barometer with recording chart attachment - uses double acting motor to position piston in tube providing temp. correctionA glass or metal tube is inserted into a deep reservoir and contains a depression piston. An arm is mounted on the tube to support a drum (9) driven by a clock ...
There are basically two types of barometers:Mercury Barometer: It was invented in the 1640s by Evangelista Torricelli, an Italian physicist. So, sometimes it is also known as Torricellian barometer. It comprises an inverted glass tube standing upside down in a container filled with mercury. The...
The pressure meter such as a barometer, sphygmomanometer for measuring arterial blood pressure, or manometer which uses fluid columns, giving reliable and accurate presentation of pressure to be measured. Mercury is not used and there is automatic correction for variations in the ambient temperature. ...