Excerpt from Soil Gases
Gas compressed by su7face tension - ~one factor, which may in places oper ate on the volume of gases in soils is surface tension. Suppose a bubble of gas to be surrounded by water in some small cavity in the soil, the circumstances being that the quant... ity of water is so large that it is free to enter or leave the cavity. Under such circumstances the tension of the wat er~gas surface would tend to increase the pressure on the gas beyond that generally existing in the soil and which is approximately that of the atmosphere. This subject has not I think been referred to by others when discussing the physical properties of soils, and although no direct experimental data can be offered here, the matter is deserving of consideration, because quite small spheres would be exposed to considerable excess of pressure, and the corresponding decreased volume would be included in the difference between the volume of gas esti mated and found, and would not be differentiated from gas condensed on the surface of soil particles in the foregoing method of measurement.
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