CH_V2_27 Mass Concentration of isobutylene

[mabablue]

https://sirkos.github.io/challenge/Challenge/C27.ttl.html

Variable Description: Mass concentration of isobutylene in chloroform.

[mariutzica]

My inclination would be to leave out the explicit constraint since ‘concentration’ is already defined as amount of something per amount of something else

[gwemon]

Title of issue should really either say 'Mass concentration' or specify the units so that we can justify using 'Mass concentration'. But otherwise i agree with the modelling.

[gwemon]

I take it that for the diagram above was changed after Maria made her comment.

[mabablue]

I changed now the title accordingly.

[mabablue]