# Evaporation

Evaporation . Physical process that consists of the slow and gradual transition from a liquid state to a more or less gaseous state, depending on a natural or artificial increase in temperature , is a process that transfers water from the ground back to the atmosphere

## Summary

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• 1 Evaporation
• 2 Evaporation as a physical process
• 3 Empirical formulas to determine evaporation from a lake or a lagoon
• 4 Sources

## Evaporation

Evaporation is when water goes from liquid to gaseous.

Water evaporation rates depend on various factors such as solar radiation, temperature, humidity and wind.

In hydrology , evaporation is one of the important hydrological variables when establishing the water balance of a certain hydrographic basin or part of it. In this case, a distinction must be made between evaporation from free surfaces and evaporation from the ground.

## Evaporation as a physical process

Evaporation is a physical process that consists of the slow and gradual transition from a liquid state to a more or less gaseous state, depending on a natural or artificial increase in temperature, which influences the movement of molecules , agitation molecular. With the intensification of the displacement, the particles escape into the atmosphere and consequently transform into steam. Evaporation is a phenomenon in which atoms or molecules in the liquid state gain enough energy to go into the vapor state.

## Empirical formulas to determine evaporation from a lake or lagoon

One of the simplest expressions has been proposed by Visentini, and it is applied for approximate calculations on liquid surfaces located at low elevations, where the atmospheric pressure can be considered to be approximately 760 mm of column of mercury. The empirical formulas proposed by Visentini are: (for lakes or reservoirs with a height below 200 masl) (for lakes or reservoirs with a height between 200 and 500 masl) (for lakes or reservoirs with a height greater than 500 masl) Where: E = Evaporation annual in mmt = Average annual temperature in degrees Celsius Note that for an average temperature of 10 ºC, evaporation will be between 750 mm and 1200 mm per year, that is, approximately 2 to 3 mm per day.