What is the vapor pressure of mercury?
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. This small vapor pressure can be ignored for all but very low pressure measurements. If this is water, this can change the vapor pressure of the liquid by evaporation of itself.
What is the vapor pressure of mercury at 357?
1 atm or 760mmHg.
What is the vapor pressure of mercury at room temperature?
… Since the mercury-mercury bonds are very weak, elemental mercury is more volatile than any other metal, with a vapor pressure of 0.261 Pa (2.58×10 −6 atm) at 25°C.
What pressure does mercury boil at?
Experimental Vapor Pressure Data A single vapor pressure point of mercury, the boiling point, was first measured in 1801 by Dalton , who obtained a value corresponding to 622 K; shortly thereafter, in 1803, Crichton  mentioned that the normal boiling point is above a temperature corresponding to 619 K.
Why mercury is used in barometer?
Mercury flows easily. The density of mercury is less as compared to other fluids. Changes in mercury level are easier to detect.
How does vapor pressure work?
Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid.
How do you calculate vapor pressure lower?
60 second clip suggested4:04Vapor Pressure Lowering worked Example – YouTubeYouTube
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 the vapor pressure at 25?
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). This means that if a still body of air over a lake is saturated with moisture at 25° C, there will be 0.0313 atm of water vapor in the air, and 0.969 atm of O2, N2, and other gases.
Why does mercury have a low vapor pressure?
Vapor pressure of mercury is very low (compared to a liquid like methyl alcohol) because the forces of interaction between the individual metal atoms of mercury is quite a bit stronger than the cohesive molecular forces (such a hydrogen bonding) that holds together several molecules of methanol.
How is mercury pressure measured?
Mercury manometers are generally U-shaped glass or plastic tubes containing elemental mercury with one end of the tube closed and the other open to the atmosphere. The difference in the levels of mercury in each side of the tube indicates the pressure of the gas being measured.
Is the vapor pressure of mercury valid from triple point to critical?
In this report, we review the available measurements of the vapor pressure of mercury and develop a new correlation for the vapor pressure of mercury that is valid from the triple point to the critical point. The equation is a Wagner-type form where the terms of the equation are selected using a simulated annealing optimization algorithm.
What is the measurement of the vapour pressure of mercury?
The measurement of the vapour pressure of mercury in the intermediate pressure range. PhD Thesis, University of British Co 37  Dauphinee, T.M. The vapor pressure of mercury from 40°C to 240°C: (5 microns to 6 cm) Measured by the streaming method. J.
What is the working principle of ultrahigh pressure mercury vapor lamp?
The ultrahigh-pressure mercury vapor lamp adopts a gradient heterogeneous material prepared from metallic copper (Cu) or metallic molybdenum (Mo) and quartz (SiO2). The heterogeneous part is inserted into a tungsten (W) wire to work as an electrode of the lamp.
What is the optimum temperature for a mercury vapor lamp?
In these lamps, the optimum mercury vapor pressure (which gives the maximum luminous efficacy) is 0.8 Pa. For the tube diameters normally used, this pressure is reached at a wall temperature of about 40°C, not much higher than typical ambient temperature.