# Converting Units (Medical Application)

• B
Gold Member
I need to convert mj/mm^2 to bar is there a way to do that ? I think we cannot ,bar is N/m^2 but we have j/m^2

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Doc Al
Mentor
One unit is an energy per area (energy density), but the other is a force per area (pressure). They have different dimensions and thus measure different things.

Gold Member
One unit is an energy per area (energy density), but the other is a force per area (pressure). They have different dimensions and thus measure different things.
Yes I agree, thanks

Doc Al
Mentor
Gold Member
So I needed to convert 0.55mj/mm^2 to bar and using the table can I say its approximately 7.23 bar ? But i see that the increasement is non linear so what should I do ?

Staff Emeritus
2019 Award
So I needed to convert 0.55mj/mm^2 to bar
One unit is an energy per area (energy density), but the other is a force per area (pressure).
Still true.

russ_watters
Gold Member
Still true.
Yes i agree but what abou the table ? I mean i am going to physiotherapy and they asked me this question and i said we cannot convert but she said their machines are work in adjustment or it was somwthi g lke thay.

Doc Al
Mentor
Yes i agree but what abou the table ?
I just skimmed that article, but it seems to say there are two ways of producing shockwaves. One of those ways can be characterized by the pressure used (compressed air), the other by the energy (magnetic). They are claiming they produce equivalent shock waves. Looks like some empirical chart.

(It's not a simple unit conversion, since those units are not measuring the same thing.)

Gold Member
I just skimmed that article, but it seems to say there are two ways of producing shockwaves. One of those ways can be characterized by the pressure used (compressed air), the other by the energy (magnetic). They are claiming they produce equivalent shock waves. Looks like some empirical chart.

(It's not a simple unit conversion, since those units are not measuring the same thing.)
Okay well I ll just show them the article since they are expert and I am sure they can deduce something from it