A manometer. Used to measure pressure.
A barometer consists of a glass tube filled with mercury or water, sealed at one end and open at the other. The open end is submerged in a dish of mercury or water to measure air pressure. The height of the liquid in the tube changes with changes in atmospheric pressure.
It would be the same as the pressure in the liquid outside the tube at the open end- the deeper it is in the liquid, the higher the pressure.
convex
A barometer typically consists of a glass tube filled with mercury or a liquid metal, sealed at one end and open at the other. The open end is placed in a container of mercury, allowing atmospheric pressure to push the mercury up the tube. The height of the mercury column is a measure of the atmospheric pressure.
Have you checked the rear hatch glass ?? Open it and reclose it firmly.
Mercury conducts electricity. These switches are usually used in thermometers in air conditioners, etc. There is a coil that is temperature sensitive that causes the mercury to tilt. There are also two electric poles inside of the glass the mercury is contained in. If the glass it tilted in one direction, the liquid mercury encompasses both poles and completes the circuit. If the glass is tilted in the OTHER direction, the mercury moves away from the poles and opens the circuit.
The glass tube of a mercury barometer is not typically protected because it needs to be left open to atmospheric pressure in order to accurately measure the height of the mercury column. Any protection around the tube could interfere with this measurement process.
Loads more The liquid expands more than the glass envelope. You know this because the mechanism is designed to open the water valve to the sprinkler head when the glass envelope shatters when the liquid ruptures it as it heats up.
In chemistry... it's a thin open-ended glass tube for collecting small amounts of liquid. Inserting one end of the tube into liquid allows the liquid to flow upqwards. When the liquid reaches a suitable height, a finger placed over the open end (towards the top) holds the liquid in the tube - for transferring from one place to another.
Mercury has a low adhesive force to glass, it would rather bond to itself than another surface. This tends to create a spherical surface on open mercuric faces. Balanced by gravity the hemisphere flattens and creates the slight convex shape observed.
The first barometer that was invented was the MERCURY barometer. a mercury barometer consists of a glass tube open at the bottom end and partially filled with mercury. (:
No, liquid mercury is highly toxic and can be fatal if ingested. It can cause severe damage to the internal organs and the nervous system. It is important to seek medical attention immediately if someone has ingested liquid mercury.