Table of Contents

## How do you calculate water vapor pressure from temperature?

Simple formula simple_pressure = e^(20.386 – (5132 / (temperature + 273)) , where vapor pressure is expressed in mmHg and temperature in kelvins.

## How do you calculate evaporation pressure?

In chemistry, vapor pressure is the pressure that is exerted on the walls of a sealed container when a substance in it evaporates (converts to a gas). To find the vapor pressure at a given temperature, use the Clausius-Clapeyron equation: ln(P1/P2) = (ΔHvap/R)((1/T2) – (1/T1)).

## At what pressure does water evaporate?

Specifically, water boils at about 100°C under atmospheric pressure (0.1 MPa), at about 120°C under 0.2 MPa, and at around 140°C under 0.37 MPa. The pressure cooker uses this principle.

## What is the vapor pressure of water at 20.4 ℃?

Water Vapor Pressure Chart

Temperature (oC) | Pressure (mm Hg) | Pressure (mm Hg) |
---|---|---|

21.0 | 18.6 | 355.1 |

21.5 | 19.2 | 525.8 |

22.0 | 19.8 | 633.9 |

22.5 | 20.4 | 760.0 |

## How to calculate the evaporation rate of water?

Calculate the total water surface area exposes to air. Next, determine the maximum humidity ratio. Calculate the maximum humidity ratio of saturated air at the same temperature as the surface of the water. Next, determine the current humidity ratio. Calculate the current humidity ratio of the air.

## How to calculate liquid water heat at vapor pressure?

The calculator below can be used to calculate the liquid water heat of vaporization at vapor pressure at given temperatures. The output heat is given as kJ/mol, kJ/kg, kWh/kg, cal/g, Btu (IT)/mol and Btu (IT)/lb m. Note! Temperature must be within the ranges 0-370 °C, 32-700 °F, 273-645 K and 492-1160 °R to get valid values.

## How to calculate the temperature of a swimming pool?

V = Air velocity above at the surface of water, in m/s Y = Latent heat necessary according to the change of state of the water vapor at the temperature of surface of water, in kJ/kg Function = Pool_evap1(ts1, ts, Hr, Saw, Z) – ts = Dry temperature in °C of the ambient air of the swimming pool

## What is the evaporation heat of water at 20oC?

The evaporation heat (enthalpy) of water at temperature at 20oC is 2454 kJ/kg. The heat supply required to maintain the temperature of the water in the swimming pool can be calculated as.