Canadian Heritage Information Network, Canada Museum of Science and Technology, Musée de la civilisation, Stewart Museum, Canadian Medical Hall of Fame, Museum of Health Care at Kingston, University Health Network Artifact Collection, University of Toronto Museum of Scientific Instruments, University of Toronto Museum Studies Program, Suzanne Board, Dr. Randall C. Brooks, Sylvie Toupin, Ana-Laura Baz, Jean-François Gauvin, Betsy Little, Paola Poletto, Dr. James Low, David Kasserra, Kathryn Rumbold, David Pantalony, Dr. Thierry Ruddel, Kim Svendsen


The pressure exerted on an object is due to the weight of the solid, liquid or gaseous matter located directly above it. Thus, if it is placed at the bottom of a tank filled with water, it bears the weight of the air and water above it. The closer to the bottom the object is, the greater the pressure exerted on it since the weight of the water is greater. Also, the greater the pressure on the liquid, the more quickly it seeks to evade that pressure. The tank opposite shows how pressure effects the speed at which the water leaves the tank. Since the pressure is greater at the bottom of the tank, the water escaping from the lowest spout flows more quickly and further than the water escaping from the other openings.

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