Liquid Surface tension y(N/m) Water at 0°C 0.0756 Water at 20°C 0.0728 Water at 100°C 0.0589 Soapy water (typical) 0.0370 Ethyl alcohol 0.0223 Glycerin 0.0631 Mercury 0.465 Olive oil 0.032 Tissue fluids (typical) 0.050 Blood, whole at 37°C 0.058 Blood plasma at 37°C 0.073 Gold at 1070°C 1.000 Oxygen at -193°C 0.0157 Helium at -269°C 0.00012
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
(a) The pressure inside an alveolus with a 2.00×10−4 -
m radius is 1.40×103 Pa , due to its fluid-lined walls.
Assuming the alveolus acts like a spherical bubble, what is
the surface tension of the fluid? (b) Identify the likely fluid.
(You may need to extrapolate between values in Table.)
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