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I recently found this conversion table for the unit conversion $\rm mmol/m^3 \ \leftrightarrow\ \rm mmol/L$ (millimoles per cubic meter to millimoles per liter)

My physics is very rusty, but just to be sure, is it true that a liter of liquid always corresponds to a particular volume? (i.e.: Doesn't change with regards to temperature, pressure, etc?)

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    $\begingroup$ This isn't a homework question - OP is asking a (basic but) perfectly reasonable question about unit conversion. $\endgroup$ – Emilio Pisanty Mar 16 at 16:01
  • $\begingroup$ Google has a unit converting feature which can take input in cubic meters and give you liters. That should suggest the answer ;) $\endgroup$ – user191954 Mar 16 at 16:01
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    $\begingroup$ @Chair that isn't my question thought is it? I am asking if the conversion always holds (ie: one liter is always a specific amount of volume) regardless of other paramters we change. $\endgroup$ – DarioP Mar 16 at 16:54
  • $\begingroup$ Meta discussion: physics.meta.stackexchange.com/q/11160/44126 $\endgroup$ – rob Mar 16 at 17:01
  • $\begingroup$ @DarioP The point I wished to make was that if the unit converter can do such things without specifying other parameters, it strongly suggests that the units measure the same physical quantity. $\endgroup$ – user191954 Mar 17 at 2:43
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is it true that a liter of liquid always corresponds to a particular volume?

Yes, this is correct. The relationship $$ 1\:\mathrm{L} = 10^{-3} \:\mathrm{m}^3 \tag 1 $$ (i.e. one cubic meter is a thousand liters) is universal and it does not depend on anything. The liter is a unit of volume - by definition, it's a cubic decimeter.

To convert between $\rm mmol/L$ and $\rm mmol/m^3$, simply insert the relationship above: \begin{align} \rm 1\: mmol/L & = \rm 1\:mmol / (10^{-3}\:m^3) \\ & = \rm 10^{3}\:mmol / m^3, \end{align} and vice versa.

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