So, that means water temperature is a major controller of the evaporation rate.
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Of course, as you know, the vibration of molecules depends on temperature: the higher the temperature, the faster the molecular vibrations, and the more likely a liquid water molecule will break free from its neighbors and evaporate into water vapor. To better understand how net evaporation and net condensation are achieved, we need to understand a bit more about what controls the evaporation rate (the number of water molecules evaporating in a given area over a given time period) and the condensation rate (the number of water vapor molecules condensing into liquid water in a given area over a given time period).įor starters, the bonds that loosely connect water molecules in the liquid phase aren't all that strong, so occasionally, the natural vibration of water molecules breaks these bonds, resulting in evaporation. The states of net evaporation and net condensation are extremely important to weather forecasters, because they have implications for cloud and precipitation formation, as well as evaporation of precipitation (and subsequent evaporational cooling) among other things.
On the other hand, assuming you have some liquid water present to begin with, "net" evaporation, which means that the evaporation rate exceeds the condensation rate, causes liquid water droplets to shrink (or disappear altogether), or puddles on the ground to dry up, etc. "Net" condensation means that the condensation rate exceeds the evaporation rate causing liquid water droplets to form. Obvious phase changes occur when there's either "net" condensation or "net" evaporation (assuming you have some liquid water to begin with). It comes in the form of an absolute value measured by specialized dew point meters over various levels of temperatures and it is often used in industries that require calibration of humidity sensors.In the last section, I asserted something that may have been surprising: evaporation and condensation are occurring around you simultaneously all the time, but you often don't see the results because they're happening on the molecular level. This concept is used to express how much water vapor is in the air at a specific moment, thus the higher the dew point is, the more humid the air is perceived. In physics, the dew point refers to the temperature at which the water vapor from an air sample being exposed to a constant pressure condenses into liquid water at the same rate as the water vaporization rate. Source: Martin Wanielista, Robert Kersten & Ron Eaglin, 1997 - Hydrology Water Quantity and Quality Control.
This calculator uses the following temperature conversion rules: The temperature (air or dew point) can be specified in Celsius (☌), Fahrenheit (☏) or Kelvin (°K). T = air temperature considered to be in Celsius (☌). Td = dew point temperature expressed in Celsius (☌).
dew point temperature by knowing the air temperature and the relative humidity humidity percentage if you provide the dew point and air temperatures in Celsius (☌), Fahrenheit (☏) or Kelvin (°K) This is a physics calculator that can help you determine either the: How does this relative humidity calculator work?
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