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.
This Home Energy classic, originally printed in 1986, explains a simple way to take one air infiltration measurement and determine a home's average air infiltration rate. Many researchers have sought to develop a correlation between a one-time pressurization test and an annual infiltration rate.average infiltration rate (ACH) = ACH50(1) ----- 20. A person conducting pressurization tests on a particular house can collect considerable information about these details.any researchers have sought to develop a correlation between a one-time pressurization test and an annual infiltration rate. average infiltration rate (ACH) = ACH50(1) ----- 20. A person conducting pressurization tests on a particular house can collect considerable information about these details.