You will need
  • formula for determination of geometrical bodies;
  • - measuring vessel or container in shape;
  • - known gas mass.
If the container has a regular geometric shape (cuboid, prism, pyramid, sphere, cylinder, cone, etc.), measure its internal linear dimensions and make the calculation. For example, if a barrel has the shape of a cylinder, measure its inner diameter d and h visotu. Then calculate the volume by the formula for determining the volume of the cylinder. For this, the number π≈3,14 multiply by the square of the base diameter and the height of the barrels, and the result divide by the number 4 (V=π∙d2∙h/4). For other geometric bodies also use the appropriate formula for the volumes.
In that case, if you calculate the volume of difficult, because of the shape of the tank, fill the tank with fluid (water) so that it completely filled her. In this case, the volume of water is equal to the volume of the measured capacitance. Then carefully drain the water in a separate vessel. This can be a special measuring cylinder with graduation marks or the capacity of a geometrically correct form. If the water is poured into a measuring cylinder or other container, on its scale, determine the amount of liquid. It will be equal to the desired value for the measured capacitance. If the water is filled in a container of correct shape, calculate its volume by the method described in the previous paragraph.
Sometimes the capacity is too big in order to be able to use liquid. In this case, upload it in a known mass of gas (this is only possible if it is possible to seal), with known molar masses, for example, of nitrogen M=0,028 kg/mol. Then measure the pressure with a pressure gauge and temperature thermometer inside the tank. The pressure expressed in Pascals and temperature in Kelvins. Determine the volume of the injected gas. For this the mass of gas m multiply by its temperature T and universal gas constant R. the Result divide by the molar mass M and the pressure P (V=(m∙R∙T)/( M∙P). The result is in m3.