Last Updated：2025/11/21
(chemistry, physics) The energy required to initiate a reaction. For example, the flame from the fuse of a firecracker provides a small initial amount of energy, after which the explosive reaction proceeds by itself, releasing a considerably larger quantity of energy. A small push given to a stable but top-heavy object may cause it to fall over; the potential energy released during the fall was present in the system all along but could not be realized as long as the object was upright and balanced.
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activation energy
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Source Word
activation energy
Noun
(chemistry,
physics)
The
energy
required
to
initiate
a
reaction.
For
example,
the
flame
from
the
fuse
of
a
firecracker
provides
a
small
initial
amount
of
energy,
after
which
the
explosive
reaction
proceeds
by
itself,
releasing
a
considerably
larger
quantity
of
energy.
A
small
push
given
to
a
stable
but
top-heavy
object
may
cause
it
to
fall
over;
the
potential
energy
released
during
the
fall
was
present
in
the
system
all
along
but
could
not
be
realized
as
long
as
the
object
was
upright
and
balanced.
Japanese Meaning
化学反応や物理現象において、反応を開始するために必要な最小限のエネルギー
Sense（1）
(chemistry,
physics)
The
energy
required
to
initiate
a
reaction.
For
example,
the
flame
from
the
fuse
of
a
firecracker
provides
a
small
initial
amount
of
energy,
after
which
the
explosive
reaction
proceeds
by
itself,
releasing
a
considerably
larger
quantity
of
energy.
A
small
push
given
to
a
stable
but
top-heavy
object
may
cause
it
to
fall
over;
the
potential
energy
released
during
the
fall
was
present
in
the
system
all
along
but
could
not
be
realized
as
long
as
the
object
was
upright
and
balanced.
（ plural ）
