# What is mm Hg?

Millimeter of mercury. From Wikipedia, the free encyclopedia. A millimeter of mercury is a manometric unit of

**pressure**, formerly defined as the extra**pressure**generated by a column of mercury one millimetre high and now defined as precisely133.322387415 pascals. It is denoted by the symbol**mmHg**or**mm Hg**.A.

### How many CMHG is in 1 atm?

conversion result for two pressure or stress units: | ||
---|---|---|

From unit Symbol | Equals Result | To unit Symbol |

1 atmosphere atm | = 76.00 | centimeters of mercury cmHg |

#### What is meaning of cm Hg?

**cmHg**– Centimetres of Mercury at 0 deg C Pressure Unit.**Centimeters**of Mercury is a small pressure unit which represents the pressure pushing down due to gravity of any volume of liquid mercury which is 1cm high.#### What is considered to be high atmospheric pressure?

The Earth's**atmosphere**exerts a**pressure**on the surface.**Pressure**is measured in hectoPascals (hPa), also called millibars. Standard**pressure**at sea level is defined as 1013hPa, but we can see large areas of either**high**or low**pressure**. As**air**warms, it ascends leading to low**pressure**at the surface.#### What do high pressure systems bring?

A**high pressure system**is a whirling mass of cool, dry air that generally**brings**fair weather and light winds. When viewed from above, winds spiral out of a**high**-**pressure**center in a clockwise rotation in the Northern Hemisphere. These**bring**sunny skies.

B.

### What is the standard pressure?

**Standard**temperature and

**pressure**, abbreviated STP, refers to nominal conditions in the atmosphere at sea level.

**Standard**temperature is defined as zero degrees Celsius (0

^{0}C), which translates to 32 degrees Fahrenheit (32

^{0}F) or 273.15 degrees kelvin (273.15

^{0}K).

#### What is the standard pressure in ATM?

“The standard atmosphere (symbol: atm) is a unit of pressure defined as**101325 Pa**(**1.01325 bar**), equivalent to**760 mmHg**(torr), 29.92 inHg and 14.696 psi.”#### What is the standard pressure?

**Standard**temperature and**pressure**, abbreviated STP, refers to nominal conditions in the atmosphere at sea level.**Standard**temperature is defined as zero degrees Celsius (0^{0}C), which translates to 32 degrees Fahrenheit (32^{0}F) or 273.15 degrees kelvin (273.15^{0}K).#### What are the conditions for STP?

For chemistry, IUPAC established standard**temperature**and pressure (informally abbreviated as STP) as a**temperature**of 273.15 K (0 °C, 32 °F) and an absolute pressure of 101.325 kPa (14.7 psi, 1.00 atm, 1.01325 bar).

Updated: 28th September 2018