As the change of vapour pressure of ether is large for small changes of temperature the thermometer is very sensitive to small changes in the radiation falling on either bulb. (hubpages.com)
In a warming world, atmospheric water vapour content is expected to rise due to an increase in saturation water vapour pressure with air temperature. (sciencedaily.com)
Diurnal variation in stem girth as affected by three different ranges (0.43, 1.78 and 2.11 kPa) of air vapour pressure deficit (VPD) under minimum soil water stress was studied in mature rubber trees (Hevea brasiliensis) in Northeast Thailand. (connection.ebscohost.com)