PHYS 101 Lecture Notes - Buoyancy, Spring Scale, Hydrometer
9 Aug 2014
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Key points: pressure and pascal"s principle, buoyancy and archimedes" principle. The three common phases of matter are solid, liquid, and gas. A solid has a definite shape and size. A liquid has a fixed volume but can be any shape. A gas can be any shape and also can be easily compressed. Liquids and gases both flow, and are called fluids. The density of a substance is its mass per unit volume: Water at 4 c has a density of 1 g/cm3 = 1000 kg/m3. The specific gravity of a substance is the ratio of its density to that of water. Pressure is defined as the force per unit area. Pressure is a scalar; the units of pressure in the si system are pascals: 1 pa = 1 n/m2. i-clicker question 22-1: unit conversion from cm2 to m2. 500 cm2 is equal to: 50. 0 m2, 5. 00 m2, 0. 500 m2, 0. 0500 m2, 0. 00500 m2.
