What is the vapour pressure of mercury?
0.05 to 800 kPa
The vapour pressure of mercury has been determined ebulliometrically over the range 0.05 to 800 kPa (380 to 770 K): above 3 kPa (480 K) by the comparative method with water as the standard, and below 5 kPa by direct measurement of the pressure with a mercury manometer.
Which has higher vapor pressure mercury or water?
Water has weaker inter-particle force. Hence, the Water has a higher vapour pressure than mercury.
What is the vapor pressure of mercury at 357?
1 atm
1 atm or 760mmHg.
What is the normal vapor pressure of water?
Examples
| Substance | Vapor pressure | |
|---|---|---|
| (Pa) | (mmHg) | |
| Tungsten | 100 Pa | 0.75 |
| Xenon difluoride | 600 Pa | 4.50 |
| Water (H2O) | 2.3 kPa | 17.5 |
Why mercury is used in barometer?
Mercury is employed in the barometer because its density is sufficiently high for a relative short column to be obtained. and also because it has very small vapour pressure at normal temperature. High density scales down the pressure head(h) to repesent same magnitude of pressure in a tube of smaller height.
What is the density of mercury vapor?
6.9
– Vapor Density of mercury is 6.9, which should mean that the mercury vapor is much heavier than air and toxic vapors should accumulate along the floor. – Density of air saturated with mercury vapor is 1.00 because its concentration is low.
Which has lowest vapour pressure?
Mercury exerts the lower vapour pressure because of the strong bond among its atom. Note: At room temperature, the substance with lowest boiling point will have the highest vapour pressure and the substance with highest boiling point will have the lowest vapour pressure.
Which has more vapour pressure?
Vapor pressure is a property of a liquid based on the strength of its intermolecular forces. A liquid with weak intermolecular forces evaporates more easily and has a high vapor pressure. A liquid with stronger intermolecular forces does not evaporate easily and thus has a lower vapor pressure.
What is the vapor pressure of mercury at 25 C?
0.0017 torr
However, a major advantage to using mercury in a manometer is the low vapor pressure of mercury, which is 0.0017 torr at 25 °C.
What is the vapor pressure of water at 25 C?
The vapor pressure of water at room temperature (25° C) is 0.0313 atm, or 23.8 mm of mercury (760 mm Hg = 1 atm).
What is a high vapor pressure?
How does a mercury barometer measure pressure?
A mercury barometer is an instrument used to measure atmospheric pressure in a certain location and has a vertical glass tube closed at the top sitting in an open mercury-filled basin at the bottom. Mercury in the tube adjusts until the weight of it balances the atmospheric force exerted on the reservoir.
Can Mercury be a vapor at room temperature?
When dropped, elemental mercury breaks into smaller droplets which can go through small cracks or become strongly attached to certain materials. At room temperature, exposed elemental mercury can evaporate to become an invisible, odorless toxic vapor. If heated, it is a colorless, odorless gas.
What temperature does Mercury vaporize?
Mercury vapor color temp is around 4200K and CRI in range of 50. All these things are HID variants and all use mercury (or sodium) but the ones called “mercury vapor” (and sodium vapor) are a monochromatic light that’s not terribly usable for serious lighting unless you absolutely have to.
How does vapour pressure increase by increasing temperature?
A substance with a high vapor pressure at normal temperatures is often referred to as volatile. As the temperature of a liquid increases, the kinetic energy of its molecules also increases and as the kinetic energy of the molecules increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.
What is vapour pressure and atmospheric pressure?
At the normal boiling point of a liquid, the vapor pressure is equal to the standard atmospheric pressure defined as 1 atmosphere, 760 Torr, 101.325 kPa, or 14.69595 psi . For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart.
