# Does water vapor have pressure?

## Does water vapor have pressure?

The vapor pressure of water is the pressure at which the gas phase is in equilibrium with the liquid phase. The high surface tension of water (water “sticks” to itself, so it doesn’t “want to” evaporate) means water has a low vapor pressure.

### How do you calculate water vapor pressure?

Simple formula simple_pressure = e^(20.386 – (5132 / (temperature + 273)) , where vapor pressure is expressed in mmHg and temperature in kelvins.

#### What is the vapor pressure of water in kPa?

Water is a polar liquid whose molecules are attracted to one another by relatively strong hydrogen bonding. The vapor pressure of water at 20°C is only 2.33 kPa, far less than that of diethyl ether.

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NIST provides a comprehensive set of easy-to-use databases and online systems that help the analytical chemist identify unknown materials and obtain physical, chemical, and spectroscopic data about known substances. The databases and online systems are updated and expanded on a regular basis.

How does water vapor affect air pressure?

The water vapor molecules don’t travel far after a collision, so they collide more frequently. Therefore, as humidity increases (more water vapor in the air), air pressure decreases, and as humidity decreases, air pressure increases.

## What is the vapor pressure of water at 25c?

23.8 torr
In your case, you know that the vapor pressure of pure water at 25∘C is equal to 23.8 torr.

### What is the vapor pressure of water at 70oc?

In your case, you know that the vapor pressure of pure water at 25∘C is equal to 23.8 torr.

#### What liquid has the highest vapor pressure?

methyl chloride
For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart.

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### What is the molecular weight of water vapor?

Molecular weight: 18.0153 Download the identifier in a file. IUPAC Standard InChIKey: XLYOFNOQVPJJNP-UHFFFAOYSA-N The 3d structure may be viewed using Java or Javascript . Other names: Water vapor; Distilled water; Ice; H2O; Dihydrogen oxide; steam; Tritiotope Permanent link for this species.

#### Is there a fee to use the NIST Thermo Tables?

NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data) NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites.

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