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Pressure variations in different parts of a home can almost always be found within the fixtures themselves. Sometimes, a generalized pressure problem can be traced to nothing more complicated than a well-overdue whole-house water filter replacement! However, the variations throughout your home probably can't be attributed to a single, localized problem.
Atmospheric pressure will support a column of mercury to about 760 mm. Mercurial air pressure is described as '760 mmHg'. As air pressure changes , the height of this column will also change. If you did it with water, the column would have to be about 34 feet (10.2 metres) in height.
Planet Mercury's Surface pressure is almost none existent. This is due to its low gravity and extremely thin atmosphere that has been blasted away by solar winds.
Mercury has almost no atmosphere so that could be the answer. The otherpossible answeris Mars, which certainly does have a (thin)atmosphere.
The basic principle of barometer is Torricelli's experiment. Imagine that you fill a tube of one metre length (100cm) with mercury up to the brim. Then close the mouth of the tube with your thumb and invert the tube and place it in a cistern of mercury with its end immersed in the mercury say some 4 cm. Now you remove your thumb. Mercury would come down but it stops at one level to our astonishment. This level would be some 20 cm from the closed end of the tube. So there will be almost 76cm column of mercury in the tube. Why is it so? As mercury comes down the space left vacant will not be having any air molecule and so it is almost vacuum. This is named as Torricelli's vacuum. Now the air outside in the atmosphere would exert a pressure and wants to push the mercury towards this vacuum place. But the weight of the mercury column (76cm) will balance this pressure. Hence we say the atmospheric pressure will be 76 cm of mercury. This is how we have mercury scale for measuring the pressure. Usually pressure is defined as the force per unit area. Hence the unit will be N/m2 or pascal. But we give pressure only in cm or mm of mercury. The reason is explained properly. Same technique is applied in Fortin's barometer and vernier arrangement is made to measure the pressure so accurately.
Mercury has almost no atmosphere and so there is nothing to hold the Solar heat in. As a result the temperature drops during Mercurial nights. The polar regions of Mercury get very little direct sunlight and so they are always below 180 K.
Mercury has almost no atmosphere
Mars has almost no atmosphere. APEX=MERCURY has no atmosphere.
When the pipe thaws, the pump will run almost constantly. Watch your pressure gauge on the tank and if it will not rise, or has problem building pressure above 30 psi, then yo almost certainly have a broken pipe.
Mercury
You have a problem with either the pump or the pressure regulator. Call an expert and have this repaired.
There aren't. Mercury has almost no atmosphere. Therefore, it cannot have storms.