Barometer
| Formula / Notation | P = ρgh (mercury column) |
|---|---|
| Also Known As | Mercury barometer; aneroid barometer; Torricelli barometer; atmospheric pressure gauge |
What is Barometer?
A barometer is a scientific instrument used to measure atmospheric (air) pressure. The most common type (Torricelli barometer) consists of a vertical glass tube filled with mercury, inverted into a dish of mercury. Atmospheric pressure supports the mercury column; standard pressure (1 atm) equals 760 mm of mercury (mmHg or torr).
Formula & Notation
Other Names / Synonyms: Mercury barometer; aneroid barometer; Torricelli barometer; atmospheric pressure gauge
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A barometer is a scientific instrument used to measure atmospheric (air) pressure. The most common type (Torricelli barometer) consists of a vertical glass tube filled with mercury, inverted into a dish of mercury. Atmospheric pressure supports the mercury column; standard pressure (1 atm) equals 760 mm of mercury (mmHg or torr).
Meteorology (weather forecasting); aviation (altimetry); industrial process control; laboratory measurements of gas pressure; clinical blood pressure measurement (sphygmomanometer uses similar principle)
Mercury barometers contain liquid mercury — highly toxic. Avoid breakage; mercury vapour is poisonous. In modern labs, aneroid or digital barometers are preferred. Proper disposal of mercury barometers required according to local regulations.
The formula or notation for Barometer is: P = ρgh (mercury column)