Hectare- A
metric measure of area (10,000 square meters), equal to 2.471
acres.
Hectopascal- A unit of pressure measurement, one hectopascal equals 100 Pascals (1 hPa = 100 Pa = 1 mb)
Henry- Named for Joseph Henry, American scientist, who made several discoveries related to electricity and magnetism.
Hertz- The
standard unit of measurement for frequency in cycles/second; prefixes include
kilo (103), mega (106), and giga (109), abbreviated kHz, MHz, and GHz; replaces
cycles per second in modern usage. Named for German scientist Heinrich Rodulf Hertz, who made several contributions to the science of electromagnetism.
Hour- A period
of time equal to 60 minutes (the hour was originally defined in Egypt as 1/24 of
a day, based on their duo-decimal numbering system)
