Ballast
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Something that improves stability:
---
Track Ballast
(
Gravel
or
Cinder
s) forms the
Railroad
or
Railway
track-bed on which
Sleepers
and
Track
is laid. The ballast allows for proper
Drainage
and minimizes
Frost Heaving
.
---
Ship's Ballast
(
Water
,
Sand
,
Rock
s, or
Brick
s) is used to weight a
Ship
down when it has very little
Cargo
(though water may contain
Invasive Species
of
Pest
s). It can also be a
Mass
used in a
Sailboat
to provide stability.
---A
Ballast Tank
is a device used on
Submarines
and other
Submersibles
in order to control bouyancy, allowing the vehicle to surface or dive.
---A
Ballast (electrical)
is used to stabilize the current flow in lamps.
A village in