- sealed mercury barometer
- 固封水银气压计
Atmospheric Sciences (English-Chinese) dictionary. 2014.
Atmospheric Sciences (English-Chinese) dictionary. 2014.
mercury barometer — noun barometer that shows pressure by the height of a column of mercury • Hypernyms: ↑barometer * * * a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on… … Useful english dictionary
mercury barometer — a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with … Universalium
Barometer — Schematic drawing of a simple mercury barometer with vertical mercury column and reservoir at base … Wikipedia
Vacuum — This article is about empty physical space or the absence of matter. For other uses, see Vacuum (disambiguation). Free space redirects here. For other uses, see Free space (disambiguation). Pump to demonstrate vacuum In everyday usage, vacuum is… … Wikipedia
Vacuum pump — A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke. Types Pumps can be broadly categorized according to three… … Wikipedia
Cox's timepiece — is a clock developed in the 1760s by James Cox. It was developed in collaboration with John Joseph Merlin (with whom Cox also worked on developing automata). Cox claimed that his design was a true perpetual motion machine, but as the device is… … Wikipedia
Atmospheric pressure — Air pressure redirects here. For the pressure of air in other systems, see pressure. Atmospheric pressure is the force per unit area exerted against a surface by the weight of air above that surface in the Earth s atmosphere. In most… … Wikipedia
Timeline of temperature and pressure measurement technology — A history of temperature measurement and pressure measurement technology.Timeline800s* 800s mdash; Differential pressure controls developed by the Banū Mūsā brothers. [citation|title=Ancient Discoveries, Episode 12: Machines of the East|publisher … Wikipedia
Torricellian tube — /tɒrətʃɛliən ˈtjub/ (say toruhcheleeuhn tyoohb) noun a vertical and partially evacuated glass tube which is sealed at the top but open at the bottom to a reservoir of liquid which rises or falls in the tube in response to atmospheric pressure;… …
Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… … Wikipedia
Siphon — Not to be confused with Psiphon. This article is about the domestic device. For the animal organ, see siphon (disambiguation). Siphon principle … Wikipedia