# Method for unit conversion?

1. Jul 5, 2014

### Dave_

I need to convert 12.5 MPa·mm1/2 into MPa.m1/2.

I am unsure on how to do this, my two guesses are as follows:

1. (12.5) / ( 1 / 10001/2) = 395.28 MPa.m1/2

2. (12.5) / (12.5 / 10001/2) = 31.62 MPa.m1/2

Is either of those correct? Thanks!

2. Jul 5, 2014

### Segala

Dear Dave,
is the 1/2 exponent correct? Isn't it -2?
Best regards!

3. Jul 5, 2014

### Dave_

I've just doubled checked and the 1/2 exponent is correct, the value is a material constant. Is it possible to convert it into MPa.m1/2? Thanks.

4. Jul 5, 2014

### Nathanael

It should be possible.

(MPa = "MegaPascal"?)
(mm = "millimeter"?)

(If those $\uparrow$ are the units then) Your original two answers shouldn't be right, because you would expect the answer to be significantly smaller, right?

(Converting mm to m would decrease the numerical value)

5. Jul 5, 2014

### Dave_

Ahh I see, so should I be calculating (12.5 / 10001/2) = 0.395 MPa.m1/2?

Thanks!

6. Jul 5, 2014

### Nathanael

Yeah

The meticulous method of figuring it out would be:
$12.5 MPa(mm)^{1/2}=12.5MPa(\frac{m}{1000})^{1/2}=\frac{12.5MPa\cdot m^{1/2}}{1000^{1/2}}=0.395MPa\cdot m^{1/2}$

7. Jul 6, 2014

### Segala

Dear Dave,
this is new to me! What is this unit used for?

Best regards!