Elavhõbedasambast

Elavhõbedasambast refers to a historical mercury column used in a specific type of barometer. These barometers, known as mercury barometers, were developed in the 17th century and were the standard instrument for measuring atmospheric pressure for over 200 years. The column of mercury within a sealed glass tube, open at one end and inverted into a reservoir of mercury, is the key component. The height of this mercury column directly correlates to the atmospheric pressure. Higher pressure pushes down on the mercury in the reservoir, forcing the mercury in the tube to rise. Conversely, lower pressure allows the mercury in the tube to fall. The unit of measurement for atmospheric pressure, the millibar, is derived from this principle, as is the standard atmosphere unit. While highly accurate for their time, mercury barometers have largely been replaced by electronic or aneroid barometers due to the toxicity of mercury and the convenience of modern instruments. However, they remain important in scientific history and are still used in some specialized applications where their precision is paramount and safety protocols are strictly followed. The term "Elavhõbedasambast" specifically highlights the mercury column itself as the operative part of the barometer.