Physiologists often express the stomatal conductance into units of mol/m**2s.
In meteorology, we use units of m/s for conductance of water vapor or CO2 uptake by plants. How do we make the conversion?
This is a transport problem. Units of mol/(m^2 s) are units of flux: the mass transfer rate across a surface boundary. In Fick's law, the transport flux equals the rate transport coefficient (the quantity in m/s that you are looking for) times the concentration gradient (in this case the concentration of CO2 from the air bulk to the interface to the bulk in the plant tissue). If you have an estimate for the flux and for the gradient, you could estimate the rate coefficient.
Easy, you just use the factor converting conductance in units of mm s-1 to mmol m-2 s-1 as follow: g/g = P/RT where P is the atmospheric pressure, T is the air temperature and R is the gas constant, [g] = mmol m-2 s-1 and [g] = mm s-1 so do the inverse cause you need mm s-1 or m s-1, be careful with units. This factor at 25 °C and a P of 100 kPa is 40.3.
Dear Mr Robichaud, our collegues are on target.
Look here:
http://amazonpire.org/PDF/fc2009/readings/TranspirationLeafConductance_Chptr08.pdf
Cheers
Valerio
Dear sir,
I want to convert mol m-2 s-1 to m mol m-2 s-1
If I multiply it with 1000. Am I doing right?
mesophyll conductance unit is mol m-2s-1bar-1. I need to convert this into ms-1 in order to use in an environmental model. can any one explain this to me, how to convert units?
you can look at:
Körner, C., Scheel, J.A., Bauer, H., 1979. Maximum leaf diffusive
conductance in vascular plants. Photosynthetica 13, 45–82.
bests
I want to convert mole per square metre per second transpiration rate to ml of water loss per square metre per second?
I am just taking one mole equal to 18 g of water? Does it right?
A. S. Brar Data Conversion factors and general equations applied in agricult...
