I just updated the respfun package with three new functions:

https://github.com/nicholascarey/respfun

eff_vol

This calculates the ‘effective volume’ of a respirometer, that is the volume minus the volume of the specimen. This allows you to input the correct water volume into respirometry analyses in order to calculate the correct amount of oxygen used, for example in the respR::convert_rate function.

spec_density

This function calculates a specimen density from a total wet mass and a buoyant mass

wm_to_vol

This is a simple function to convert a water mass to a water volume.

More details on the Github landing page!