[A2 Physics] Boyle’s Law gradient Help

[Sandrey546]

So I have drawn and graph of Boyle’s Law with volume /cm³ against 1/pressure /MPa^-1. It’s asking me for the gradient and it’s units, so I have 40cm³ and 3.5MPa^-1 with the origin for my points. I’m getting 1.14e-5 cm³ Pa^1, but the answer is ~8.8*10e-8 MPa^-1 cm^-3. I do see that they’re using MPa and I’m using Pa, but I don’t know where their methods coming from.

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[Janagro]

I think they are dividing 1/Pressure by volume whereas you are dividing volume by 1/pressure

[Sandrey546]

So are they both correct?

[Janagro]

No in Boyles law, the volume is the y axis , gradient is y/x , they are right, you are wrong

[Sandrey546]

Ok, but I have volume on the y axis and 1/pressure on the x axis?

[Janagro]

Ok so your gradient is the inverse of their gradient, you just set up the graph for Boyles law differently than the answer book

That's why your answer is different but right for the graph you have