You will need

- formula to calculate gas pressure.

Instruction

1

Find

**the pressure of**an ideal**gas**in the presence of the values of the average velocity of the molecules, mass of one molecule and the concentration of the substance according to the formula P=⅓nm0v2, where n is the concentration (in grams or moles per liter), m0 is the mass of one molecule.2

If the condition given the density of the

**gas**and the average velocity of its molecules, calculate**pressure**by the formula P=⅓ρv2, where ρ is the density in kg/m3.3

Calculate

**the pressure**if you know the temperature of the**gas**and its concentration, using the formula P=nkT, where k is the Boltzmann's constant (k=1,38·10-23 mol·K-1), T is the absolute temperature in the Kelvin scale.4

Find

**the pressure**of two equivalent variants of the equation Mendeleev-clayperon depending on known values: P=mRT/MV, or P=νRT/V, where R is the universal gas constant (R=8,31 j/mol·K), ν is the amount of substance in moles, V – volume**of gas**in m3.5

If the clause is specified, the average kinetic energy of molecules

**of gas**and its concentration, find**the pressure**using the formula P=PC, where Ek is the kinetic energy in joules.6

Find

**the pressure**of the gas laws — isochoric (V=const) and isothermal (T=const), if the**pressure**in one of the States. In isochoric process pressure ratio in two States is equal to the ratio of temperatures: P1/P2=T1/T2. In the second case, if the temperature remains constant, the product of the pressure**of a gas**on its volume in the first state, equal the same product in the second state: P1·V1=P2·V2. Express unknown amount.7

Calculate

**pressure**the formula of internal energy of an ideal monatomic**gas**: U=3·P·V/2, where U is the internal energy in joules. Hence**the pressure**will be equal to: P=⅔·U/V.8

When calculating the partial pressure of vapor in the air, if in the condition of the temperature and relative humidity to Express

**the pressure**from the formula φ/100=P1/P2, where φ/100 — relative humidity, P1 is the partial**pressure**of steam, P2 is the maximum value of water vapor at a given temperature. During the calculation of the use tables based on the maximum vapor pressure (the maximum partial pressure) temperature in degrees Celsius.Useful advice

Use aneroid or mercury barometer, for more accurate values, if you need to calculate the gas pressure in the course of the experiment or laboratory work. For measuring gas pressure in a vessel or tank use regular or electronic manometer.