The British pint is about 20% larger than the American pint since the two systems are not compatible. Almost all other countries have standardized on the metric system, so the size of what may be called a pint varies depending on local custom.
It is usually measured by the depth (in mm) of the water layer that can enter the soil in one hour. An infiltration rate of 15 mm/hour means that a water layer of 15 mm on the soil surface, will take one hour to infiltrate. In dry soil, water infiltrates rapidly.
12 Whole House Ventilation Strategies attempted to quantify the average natural infiltration rate for typical manufactured homes. These studies established an approximate average rate of 0.25 air changes per hour (ACH) under natural conditions (3, 13, 14, 35).atural infiltration rates were measured in two mobile homes in Indiana for 16 months. The. researchers developed a correlation for the rate of infiltration as a function of inside-outside. temperature difference and wind speed.