RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Aluminium boat floating on SF6 gas. Sulphur hexafluoride (SF6) is a colourless gas with a density much higher than that of air (6.12 grams per litre, compared to 1.225 grams per litre). This clip shows a boat of aluminium foil placed on a 'sea' of SF6 gas piped into a tank. The density of SF6 is less than that of the aluminium metal (Al). However, the density of the aluminium boat is the mass of the foil plus the air contained within the boat, divided by the volume of the boat and its airspace. This is less than the density of the SF6, hence the boat floats. This is also an example of buoyancy. Towards the end of the clip, the demonstrator uses a beaker to scoop up some of the SF6 and pour it into the boat, causing it to sink.
Model release not required. Property release not required.