How to write uncertainities on different measurement

[Awsom Guy]

I need some advice on how to write uncertainities on different measurements.
I need this urgently.
Thanks

 

[fatra2]

with a delta $$x \pm \Delta x$$

 

[Awsom Guy]

i mean on measurements

 

[Nick89]

$$x = (3.01 \pm 0.01) \text{ cm}$$

You mean like that? Otherwise, your question is so vague and general, I have no idea what you want.

 

[Awsom Guy]

$$x = (3.01 \pm 0.01) \text{ cm}$$

You mean like that? Otherwise, your question is so vague and general, I have no idea what you want.

That is it exactly what I want.

 

[Nick89]

Well, what is your question about it?

You simply write down the result of your measurement, and then you decide what the uncertainty is. You round the uncertainty to one significant digit (0.0193 becomes 0.02) and you round the measurement result to the same amount of digits (as long as they are in the same units). You then write it down as
$$y = (x \pm \Delta x) \text{ [unit]}$$
where x is the measurement result and delta x the uncertainty.

 

[Awsom Guy]

Well my question was about the measurements in a ruler in mm and a protractor.
I guess it would be +/-1 degree and +/- 0.5mm.
Thanks for your help anyway.

 

[fatra2]

Hi there,

I believe I can help you with this one. The uncertainty of an analogue equipment is half the smallest measurement possible (0.5mm for your ruler). The uncertainty of a digital device is the smallest measurement possible (1mm for digital ruler that measures in mm).

Cheers