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The experiment requires a large water-filled bottle, inside which is a "diver": a small, rigid tube, open at one end, very similar to an eyedropper with just enough air so that it is nearly neutrally buoyant, but still buoyant enough that it floats at the top while being almost completely submerged. Two alternative "divers" can be constructed.
The experiment aimed to illustrate periodic trends in the alkali metal series. It showed the violent reactions of metallic sodium and potassium with water, in which the hydrogen produced subsequent explosions, and intended to demonstrate the even greater reactivity of rubidium and caesium by dropping them into a water-filled bathtub.
The hull of the boat may be made out of any material that floats. Homemade pop pop boats are often made out of wood. Boiler designs vary. Simple metal containers in the shape of a box or cylinder are common. A more efficient boiler can be made by using a metal pan whose top is a slightly concave diaphragm made out of a thin, springy metal.
Fourways Farm is a British 1993-1996 science-themed children's stop-motion animated television series produced by Case Television and Dutch Education Television from the Netherlands, and aired on Channel 4 in the United Kingdom during Channel 4 Schools between 1993 and 1996 and regularly repeated until approximately 2007.
In Drownproofing terminology, the great majority of people are "floaters". That is to say that, with the lungs fully inflated (or say at total lung capacity), they have slightly less specific gravity than water and will not start to sink until they exhale. [8] An average floater has 3–4 lb (1.4–1.8 kg) of positive buoyancy in fresh water.
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Letterman and Shaffer debate the buoyant properties of the item before they each decide on whether it will sink or float (a frequent deciding factor is the nature of the item's container). Two models then drop the item into the tank while the Late Show "Hula Hoop Girl" (Anna Jack) and "Grinder Girl" (Kiva Kahl) perform on either side of the tank.
A group of hikers encountering quicksand on the banks of the Paria River, Utah Quicksand warning sign near Lower King Bridge, Western Australia. Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).