Micromeritics produces several instruments used for determining physical adsorption isotherms. Most of these utilize the static (manometric) adsorption method, where the amount of gas adsorbed by the sample is determined from pressure and temperature measurements, and gas laws that account for the non-ideal behavior of the adsorptive. The amount of gas dosed onto the sample from a gas manifold is determined using the calibrated volume of the manifold, the absolute gas pressure in the manifold, and the manifold temperature. Pressure and temperature are recorded first before the dose to determine the initial amount of gas in the manifold, and after the dose to determine the amount of gas that remains in the manifold. The difference is the amount of gas that has moved from the manifold into the sample holder, or the amount of gas dosed onto the sample.
Micromeritics produces several instruments used for determining physical adsorption isotherms. Most of these utilize the static (manometric) adsorption method, where the amount of gas adsorbed by the sample is determined from pressure and temperature measurements, and gas laws that account for the non-ideal behavior of the adsorptive. The amount of gas dosed onto the sample from a gas manifold is determined using the calibrated volume of the manifold, the absolute gas pressure in the manifold, and the manifold temperature. Pressure and temperature are recorded first before the dose to determine the initial amount of gas in the manifold, and after the dose to determine the amount of gas that remains in the manifold. The difference is the amount of gas that has moved from the manifold into the sample holder, or the amount of gas dosed onto the sample.
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