What is the standard atmospheric pressure? What is atmospheric pressure?

The atmospheric pressure is valued at. According to the formula of liquid pressure p= gh, p = kilogram cubic meter Newton kilogram meter = Paz =

Standard atmospheric pressure.

The barometric pressure at sea level under standard atmospheric conditions, the value of which is a unit of pressure, is denoted as ATM.

1. The standard temperature and pressure (STP) was once defined as 0°C in chemistry (and, but since 1982, IUPAC has redefined the "standard pressure" as 100 kPa.

Standard atmospheric pressure = 760 mm Hg = 76 cm Hg = water column. 1 standard atmosphere = 101325 n. (Usually 1 standard atmosphere = n in calculations).

1 standard atmosphere = 101 325 pascals = 760 mm Hg = meters of water.

The Torricelli experiment measures the standard atmospheric pressure:

Equipment: a glass tube about 1m long with an open end, a mercury tank, mercury, and a scale.

Procedure: Fill the glass tube with the opening pointing upwards with mercury.

Plug the nozzle with your fingers and place it upside down inside a mercury trough filled with the right amount of mercury.

Use a scale to measure the height difference h between the mercury surface inside and outside the tube.

Result analysis: Since there is a vacuum above the glass tube, the pressure generated by the mercury column at h high is balanced with the atmospheric pressure. So there is:

P gas = P mercury = mercury gh

Known: h=760mm= density= multiplied by 10 to the third power kg per cubic meter g = per kg

Solution: p = density multiplied by gh= multiplied by 10 times the power of each kg is approximately equal to the fifth power of the multiplied by 10 pa

A: .013 times 10 to the fifth power PA

Atmospheric pressureThe correct value for is .

This is the data calculated by professional researchers, and everyone should have been exposed to it in physics class.

The international unit of gas finger molding.

It is Pascal, abbreviated as Pa, and the symbol is Pa. In meteorology, people generally use kilopascals (kpa) or hectopa (hpa) as the unit.

Discovery and application

In October 1640 after a lot of experiments Torri Galileo.

The assistant Torricelli realized: the weight of the air in the atmosphere on the basin of mercury.

Pressure is applied, and this force presses the mercury into the glass tube. The weight of the mercury in the glass tube should be exactly equal to the weight exerted by the atmosphere on the mercury in the basin.

When the weight of the atmosphere changes slowly, the pressure it exerts on the basin increases or decreases, causing the mercury column in the glass tube to rise or fall. Weather changes inevitably cause changes in the weight of the atmosphere. Torricelli discovered atmospheric pressure.

A way to measure and study atmospheric pressure was found.

Torricelli's discovery was the beginning of a formal study of the weather and atmosphere, allowing us to begin to understand the atmosphere.

for Newton. and other scientists who studied gravity laid the foundation. This new discovery also led Torricelli to create the concept of vacuum hunger and invent the barometer, the basic instrument for meteorological research.

Application of atmospheric pressure: press a plastic hook with a suction cup on a very flat wall, you can use it to hang things; The piston and centrifugal pumping machine can pump water from the low place to the high place; Squeeze out the air in the pen barrel and suck the ink into the pen barrel after letting go; Use a pressure cooker.

It's easy to cook food; A small hole is made in the lid of the tea kettle, so that the water can be easily poured out; There are also high-pressure boilers, agricultural sprayers, drinking with straws, syringes.

The needle inhalation liquid and so on are all related to atmospheric pressure.

Standard atmospheric pressure. , the pressure at sea level under standard atmospheric decoupling conditions, the value of which is a unit of pressure, denoted as atm.

1. The standard temperature and pressure (STP) was once defined as 0°C in chemistry (and, but since 1982, IUPAC has redefined the "standard pressure" as 100 kPa.

Standard atmospheric pressure = 760 mm Hg = 76 cm Hg = water column. 1 standard atmosphere = 101325 n. (Usually 1 standard atmosphere = n in calculations).

The pressure exerted by the atmosphere on the object immersed in it is called atmospheric pressure.

Abbreviated as atmospheric pressure or barometric pressure. In 1654, Glick conducted the famous Magdeburg hemispheric experiment in Magdeburg, Germany.

It is a strong proof of the existence of atmospheric pressure, which makes people have a deep understanding of atmospheric pressure.

Object pressure: p=f s (The International System of Units is used in all cases.)

When the force area is constant, the greater the pressure, the more obvious the effect of pressure. (At this time, the pressure is proportional to the pressure) Under the condition that the pressure is constant, increasing the force area can reduce the pressure; Reducing the force area can increase the pressure.

The standard atmospheric pressure on the ground is approximately equal to the pressure produced by a column of mercury at a height of 760 mm. Due to the influence of conditions such as the measurement area, the measured values are different. According to the formula of liquid pressure and strong spring hunger p= gh, p = kilogram cubic meter Newton kilogram meter = Paz =

Standard atmospheric pressure is the pressure at sea level at a temperature of 15 degrees Celsius, latitude 45 degrees latitude, and a humidity of 0, and its value is millibar. This pressure is the reference standard for global atmospheric pressure, and it has a wide range of applications in many fields such as earth meteorology, flight, and barometric measurement. It's so disturbing.

In addition to the standard atmospheric pressure at sea level, atmospheric pressure will also change under different altitudes, temperatures, pressures and humidity. For example, at the same temperature, the atmospheric pressure gradually decreases as the altitude increases; At the same altitude, as the temperature increases, the atmospheric pressure also increases, and the change in humidity also affects the atmospheric pressure.

In practical applications, we need to measure atmospheric pressure through tools such as barometers to derive the current meteorological conditions and trends in air pressure changes. In addition, atmospheric pressure is also an important reference standard in aviation, aerospace and other fields, which can affect parameters such as altitude, speed and flight trajectory of the aircraft.

In general, the value of standard atmospheric pressure is millibar, and it has a wide range of applications in meteorology, aviation, aerospace and other fields. In practical application, we need to consider the change of atmospheric pressure under different conditions, and use corresponding measurement methods and tools to achieve accurate measurement of plumage, and apply it to the design and decision-making of related fields. <>