Abstract
There are many methods for measuring surface area of powders, and among them gas adsorption method(BET-method) is the best in reliance. However, "BET-method" has two weak points, one is taking comparably long time (few hours or more) to measure equiliblium pressure of the adsorption, and the other is passing through complicated calculations to get the value of surface area from the value of equiliblium pressure.
In this study "one point method" was applied to avoid a long measuring time required to get the equiliblium pressure, and a correction method was studied for inevitable error containing in "one point method".
A calculating-diagram (surface area vs. equiliblium pressure) was drawn to. abridge the complicated calculations. In this process, several factors concerned with experimental conditions were fixed as constants. However, actual measurements had given slight deviations with these factors from the fixed values, therefore some corrections were made.
The simplified procedure above mentioned needs only an hour or less for measurement, and gave a value with a deviation only less than ±5% from that by the normal BET-method.
