SCI206 : lecture-3.pdf
12 Oct 2013
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Higher temperature, higher kinetic energy, faster motion more force, greater pressure. P = number density x r x t. Pv = nrt or pressure is proportional to density of particles times temperature. Force from weight of all boxes stacked on top (ft) Force of gravity of the air in the box (fg) Force from pressure of air below pushing up (fb) If there are n boxes on top, then. Fb = (n + 1) x fg (air is not accelerating so forces cancel out) 100,000 newtons per square meter, 100,000 pascals (pa) (~10,000 kg per square meter or 14. 7 pounds per square inch) At sea level, equivalent to a bus on top of you or 1 ton per square foot. Pressure difference between top and bottom of wing. An object partially or wholly immersed in a fluid is acted upon by an upward buoyant force equal to the weight of the fluid it displaces.
