h
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h Definition
(n)
a
nonmetallic
univalent
element
that
is
normally
a
colorless
and
odorless
highly
flammable
diatomic
gas
;
the
simplest
and
lightest
and
most
abundant
element
in
the
universe
(n)
a
unit
of
inductance
in
which
an
induced
electromotive
force
of
one
volt
is
produced
when
the
current
is
varied
at
the
rate
of
one
ampere
per
second
(n)
the
constant
of
proportionality
relating
the
energy
of
a
photon
to
its
frequency
;
approximately
6
.
626
x
10
-
34
joule
-
second
(n)
the
8th
letter
of
the
Roman
alphabet
(n) (
thermodynamics
)
a
thermodynamic
quantity
equal
to
the
internal
energy
of
a
system
plus
the
product
of
its
volume
and
pressure
; "
enthalpy
is
the
amount
of
energy
in
a
system
capable
of
doing
mechanical
work
"
h Synonyms
atomic number 1
enthalpy
H
heat content
henry
hydrogen
Planck's constant
total heat
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