Media
Buoyancy – Can you drown in the dead sea? (1:52)
Mythbusters lead balloon (4:48)
This Boat Floats On Air! | Xploration DIY SCI (2:23)
Mythbusters – Helium and Sulfur Hexafluoride (0:38)
Cody’s Lab – Floating an Anvil on Liquid Mercury (4:32)
How do You Weigh a Ship? (5:01)
This description of how to calculate the buoyancy is very simplified. Modern ships are complex 3D shapes, and it is therefore very complex to calculate the volume.
Practical Displacement Calculation (6:33 – watch first 30 seconds only)
Science Spotlight: Fish, Swim Bladders and Boyle’s Law (2:34)
Perfect Buoyancy | Scuba Skills Master Series (7:06 – watch first 5:00 only)
In a boat, weight is often added to the keel (the bottom) to decrease the buoyancy, and increase the stability of the boat. If the weight is added to the wrong place, the boat will be unstable.
The Tally Ho, a wooden sailing yacht, has an 8 ton (16,000 pound) lead keel to help with stability.
Fitting the Lead Ballast Keel (Tally Ho / EP120) (do not watch)
In addition to the lead keel, there is also a lot of lead ballast (about 1.5 tons, or 3000 pounds) mounted inside the boat’s bilge (the lowest point in a boat).
Stress and excitement – final push before LAUNCH!! (26:10 – watch from 6:45 to 8:37)
As Leo Sampson says in the video, making mistakes with the ballast calculations is embarrassing, but is a fixable problem.
when you make miscalculations during your boat launch (1:05)
when you make miscalculations during your boat launch
byu/blackdutch1 inWhatcouldgowrong
700 ton fishing boat capsizes in Kaohsiung during launch | Taiwan News | RTI (0:44)