Modern submarines (depending on type) use nuclear fuel for their reactors, plus a tank of diesel fuel that acts as both reactor shielding and fuel supply for the backup diesel generator.
Diesel-Electric submarines use strictly diesel fuel.
A nuclear submarine has a reactor . There is no liquid fuel at all.
All submarine ranges and ovens are electric or microwave.
A nuclear powered submarine can remain submerged for as long as it has fuel rods and supplies for the crew.
Wood was used to make the first submarine
A submarine is only used under water.
235U with a 5% enrichment of 238U is generally used to fuel a controlled nuclear chain reaction. In a navy nuclear application, such as a submarine, a higher enrichment of 238U is used, around 20%.
they were used in wars
The submarine is under water.
A submarine was used to monitor enemy activity and then to attack by using large torpedoes.
The object used to view the outside from inside the submarine is called a periscope.
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This is an old and a common term. The torpedo has been used since the first submarine's were used in war time.