A ceramic piece, formed as a particulate aggregate, that has been
dried but not fired.
Ground
To make electrical connection to the earth or to the chassis of a
device (verb); the connection point so used (noun).
GUI
Graphical User Interface -- hardware, software, and firmware that
produces the display on modern personal computers.
Hall effect
The phenomenon whereby a force is applied to a moving electron or
hole by a magnetic field that is applied perpendicular to the
direction of motion. The force direction is perpendicular to both
the magnetic field and the particle motion directions.
Hardness
The measure of a material's resistance to deformation by surface
indentation or by abrasion. There are various scales in use to
express hardness. The Mohs scale is qualitative and somewhat
arbitrary and ranges from 1 on the soft end for talc to 10 for
diamond. Quantitative scales are the Rockwell (HR), Brinell
(indicated by HB), Knoop (HK) and Vickers (HV). Knoop and Vickers
are referred to as microhardness testing methods on the basis of
load and indenter size.
Heat capacity (Cv at constant volume and Cp at constant pressure)
The quantity of heat required to produce a unit temperature rise
per mole of material.
Heme
An iron complex.
Hemoglobin
A biomolecule composed of four myoglobine-like units (proteins
plus heme) that can bind and transport four oxygen molecules in
the blood.
HEMT
High electron mobility transistor.
Henry (H)
Unit of inductance (see"inductance"). One henry (H) is the
inductance of a closed circuit in which an electromotive force of
1 volt is produced when the electric current in the circuit varies
uniformly at the rate of 1 ampere per second.
