Barometers with Different Liquids
A mercury barometer is about 2.2 feet tall. This container of mercury weighs about 300 grams. A different volume of potassium mercury iodide [potassium tetraiodomercurate(II) solution] also weighs 300 grams. It has a different density and can can be used to make an eleven or twelve foot barometer. All these liquids weigh approximately the same but differ in volume and therefore differ in density. Water, the least dense of the three, would need a tube of about 40 feet tall to make a barometer.
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