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The Air In The Soil
Conditions of a Healthy House
Subjects > Health > Healthy Dwelling Houses
All soils and most rock formations are more or less porous, and are capable of holding in their pores and spaces air or water, or both. When air as qwell as water is present, the soil is said to be moist. Only the hardest rocks are entirely free from air. Gravel and loose sands are known to be very porous materials, the latter containing often as much as half of their bulk of air. the amount of air in some varieties of soft sandstones sometimes reaches 40 percent.
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