Instrument measuring weight or density of gases.

ETYM Hydro-, 1 + -meter: cf. French hydromčtre.
An instrument for determining the specific gravity of a liquid or solid; SYN. gravimeter.
Instrument for measuring specific gravity of liquids.
Instrument measuring specific gravity and density of liquids.
In physics, an instrument used to measure the relative density of liquids (the density compared with that of water). A hydrometer consists of a thin glass tube ending in a sphere that leads into a smaller sphere, the latter being weighted so that the hydrometer floats upright, sinking deeper into less dense liquids than into denser liquids. Hydrometers are used in brewing and to test the strength of acid in automobile batteries.
The hydrometer is based on Archimedes' principle. + prikaži više

1. A Gothic style in 14th and 15th century England; characterized by vertical lines, a four-centered (Tudor) arch, fan vaulting; SYN. perpendicular style, English-Gothic, English-Gothic architecture.
2. A straight line at right angles to another line.
3. An extremely steep face.
In mathematics, at a right angle; also, a line at right angles to another or to a plane. For a pair of skew lines (lines in three dimensions that do not meet), there is just one common perpendicular, which is at right angles to both lines; the nearest points on the two lines are the feet of this perpendicular.
Period of English Gothic architecture lasting from the end of the 14th century to the mid-16th century. It is characterized by window tracery consisting chiefly of vertical members, two or four arc arches, lavishly decorated vaults, and the use of traceried panels. Examples include the choir, transepts, and cloister of Gloucester Cathedral, about 1331–1412, and King's College Chapel, Cambridge, built in three phases 1446–61, 1477–85, and 1508–15. + prikaži više

Plumb; also; plumb line
The metal bob of a plumb line