Last Updated：2025/11/20
One of several external or internal tanks fitted in submarines; when filled with seawater they allow the boat to submerge; when emptied using compressed air buoyancy is restored and the vessel rises towards the surface. Auxiliary ballast tanks within the pressure hull allow the submarine to be trimmed.
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ballast tank
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Source Word
ballast tank
Noun
One
of
several
external
or
internal
tanks
fitted
in
submarines;
when
filled
with
seawater
they
allow
the
boat
to
submerge;
when
emptied
using
compressed
air
buoyancy
is
restored
and
the
vessel
rises
towards
the
surface.
Auxiliary
ballast
tanks
within
the
pressure
hull
allow
the
submarine
to
be
trimmed.
Japanese Meaning
潜水艦などに装備される、外部または内部に設けられたタンク。海水で満たすと潜航可能になり、圧縮空気で海水を放出して浮力を回復し、浮上する。 / 船体の傾き（トリム）を調整するために利用される補助バラスト槽。
Sense（1）
One
of
several
external
or
internal
tanks
fitted
in
submarines;
when
filled
with
seawater
they
allow
the
boat
to
submerge;
when
emptied
using
compressed
air
buoyancy
is
restored
and
the
vessel
rises
towards
the
surface.
Auxiliary
ballast
tanks
within
the
pressure
hull
allow
the
submarine
to
be
trimmed.
（ plural ）
