Last Updated：2025/11/27
(physics) The state in which a solid or liquid body has relaxed into the shape that it would have if it were a calm (equilibrium) liquid. Mathematically, this means a sphere if it is not distorted by another body and is not rotating, but an oblate or scalene ellipsoid if rotating moderately, and piriform if rotating beyond the ellipsoidal limit. When in contact with another object, such as oil drops on or in water, other shapes occur.
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hydrostatic equilibrium
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Source Word
hydrostatic equilibrium
Noun
countable
uncountable
(physics)
The
state
in
which
a
solid
or
liquid
body
has
relaxed
into
the
shape
that
it
would
have
if
it
were
a
calm
(equilibrium)
liquid.
Mathematically,
this
means
a
sphere
if
it
is
not
distorted
by
another
body
and
is
not
rotating,
but
an
oblate
or
scalene
ellipsoid
if
rotating
moderately,
and
piriform
if
rotating
beyond
the
ellipsoidal
limit.
When
in
contact
with
another
object,
such
as
oil
drops
on
or
in
water,
other
shapes
occur.
Japanese Meaning
物体（固体または液体）が、外部の力や動的な影響を受けず、内部の圧力や重力が釣り合い、安定した形状に落ち着いている状態。 / 非回転状態では理論上球体となるが、適度な回転がある場合には扁平または斜体楕円体、過度な回転の場合には梨形などの変形が生じる状態。 / 接触している他の物体（例：水中の油滴など）との相互作用によって、さらに異なる形状が現れる場合がある状態。
Sense（1）
(physics)
The
state
in
which
a
solid
or
liquid
body
has
relaxed
into
the
shape
that
it
would
have
if
it
were
a
calm
(equilibrium)
liquid.
Mathematically,
this
means
a
sphere
if
it
is
not
distorted
by
another
body
and
is
not
rotating,
but
an
oblate
or
scalene
ellipsoid
if
rotating
moderately,
and
piriform
if
rotating
beyond
the
ellipsoidal
limit.
When
in
contact
with
another
object,
such
as
oil
drops
on
or
in
water,
other
shapes
occur.
（ plural ）
