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An instrument for measuring atmospheric pressure to ascertain elevations by determining the boiling point of liquids.
Any of several instruments for determining tree heights by triangulation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an instrument for measuring atmospheric pressure by the boiling point of a liquid. A liquid begins to boil when its vapor pressure equals the external pressure; after measuring the temperature of the vapor of the boiling liquid, the atmospheric pressure is found from special tables.

A hypsometer consists of a special thermometer, from which the temperature may be read to 0.01°P, and a boiler that consists of a metal vessel containing distilled water and an extensible tube with double walls. The thermometer is put inside the tube and is bathed in the vapor of the boiling water. Hypsometers are made in which the thermometer scale divisions are units of pressure (mm of mercury, or millibars).

A hypsometer in which the liquid boils without artificial heating is used to measure pressure in the free atmosphere. The liquid used (Freon, carbon disulfide, and others) has a boiling point below the temperature of the surrounding atmosphere. Such a hypsometer usually consists of a Dewar flask containing the liquid and a miniature resistance thermometer.

A hypsometer is superior to an aneroid barometer, since it is free from errors caused by the elastic properties of the box’s membrane and by temperature; it has no mechanical transmission. However, because of its complexity it is used in radiosondes and under expedition conditions only when an aneroid barometer cannot offer the necessary accuracy of measurement.


Sternzat, M. S. Meteorologicheskie pribory i nabliudeniia. Leningrad, 1968. Chapter 4.
Nepomniashchii, S. I. “Gipsometr dlia radiozondov.” Tr. Nau-chno-issledovatel’skogo in-ta gidrometeorologicheskogo priboro-stroeniia,1966, ISSUE 16, P. 25.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Since the backseat observers had a blind spot underneath the helicopter, we used a laser rangefinder (hypsometer) to determine the minimum sighting distance for the backseat observers.
Teacher: Today we are talking about the hypsometer. This will not be an easy activity, but to begin the topic, we will use some simple materials.
The numbers of living stems and dead stumps were counted and recorded while the heights of all woody species were measured using a hypsometer and 6 m graduated pole, and a handheld GPS was used to mark the location of each sampling plot.
The most reliable tools far this purpose are no Abney hand level, a hypsometer, or a transit.
The data in this research were clear bole height which were measured using haga hypsometer and diameter, breast height (DBH) which were measured using phi-band, radius of crown which was assumed as a circle and crown radii were measured using four axes at right angles [4].
We measured tree height above the water using a 400 LH laser hypsometer (Opti-Logic Corp., Tullahoma, TN), although height varied with water depth.
The mast reliable tools for this purpose ore on Abney hand level, a hypsometer, or a transit.
The most reliable tools for this purpose are an Abner hand level, a hypsometer, or a transit.