METEOROLOGIST JEFF HABYA liquid in-glass barometer can be supplied to measure up air pressure. Exactly how this functions is that liquid completely fills the glass tube and then the tube is inverted right into a food of the liquid. The elevation of the liquid in the glass pipe varies as press rises and also falls. The room left in the tube is a vacuum. There is a balance between the liquid wanting to to fill the vacuum above it and also gravity do the efforts the push the liquid earlier into the dish. This balance changes as air pressure changes. The balance at any one time is the present air pressure. When the air push is higher there is an ext force advertise on the liquid in the dish and also this pushes the liquid higher into the tube. Mercury is the fluid of an option due come its density. Mercury has a thickness of 13,580 kg/m^3. Have actually you to be able to check out an really Mercury barometer? castle are more rare come see since barometers have advanced to using various other technologies. The average sea level press is 29.92". On median the Mercury will climb to a level the 29.92 customs (2 feet 5.92 inches) in the tube.Mercury is not the only liquid that can be used. Any type of liquid will perform but another liquid will have actually a disadvantage to Mercury. Perform you know why that is?Riddle: You build a glass tube barometer that offers Rum rather of Mercury. The Rum is 80 proof (40% ethanol alcohol and also 60% water, ignoring fixed of various other minor ingredient). When you construct this Rum barometer, what will certainly be the elevation of the fluid (give in feet and also inches) ~ above a job with typical atmospheric pressure? The thickness of water is 1,000 kg/m^3 and the density of ethanol alcohol is 789 kg/m^3Answer come Riddle: Rum has a lot lower thickness than mercury. Due to the fact that Mercury is an extremely dense the height of the glass tube only demands to be around 3 feet tall. Mercury is about 14 time denser than water therefore the water level will be around 14 times together high. We should compute the thickness of the Rum. The density is 0.4*(789 kg/m^3) + 0.6*(1000 kg/m^3) = 915.6 kg/m^3. Dividing thickness of Mercury by density of Rum determines how countless times much more the Mercury is denser than the Rum. 13,580 kg/m^3 / 915.6 kg/m^3 = 14.83180428. The typical barometric pressure using mercury is 29.92 inches.

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The elevation of the Rum under average barometric press = 29.92 * 14.83180428 = 443.77 inch = 36 feet 11.77 inches. The height of the column of Rum would need to extend to around 37 feet.