Mercury Barometer Diagram - How Atmospheric Pressure Is Measured #23280 (License: Personal Use)

This technical illustration depicts a traditional mercury barometer, where atmospheric pressure supports a column of mercury in a sealed glass tube inverted into a mercury reservoir. The measured height of the column-114 mm-is indicated by a bracket and label, representing standard atmospheric pressure conditions. Fine gradations along the tube allow precise readings for meteorological or scientific use.

Used in educational content about atmospheric science, physics textbooks, or weather instrumentation guides; matches user intent to understand barometric principles or interpret pressure measurements.