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I'm trying to finish an assignment and I keep coming back to this annoying thing about systematic and random uncertainties.
If anyone knows anything that could possibly help I will be eternally grateful! It's driving me mad!
I've done a precipitation recording experiment, and I have the data, but they need 3 examples of uncertainties, at least 1 systematic and 1 random. The 3 uncertainties I thought of are:
Wind affecting the level of water that goes in the pot, which could mean that the levels are either reduced or increased, but you cannot measure it, so it's a random uncertainty.
Rain splashing off the funnel, so less water and systematic uncertainty as I could prevent it by placing something on top of the pot to ensure the splashes go back into the pot.
and the pot falling over, which would be less water and a systematic uncertainty as it is just one loss of water, not a constant loss.
I have no idea if any of that is right, and I'm so bored of doing web research and being even more confused!
Any advice you can give would be seriously helpful.
Thanks!
If anyone knows anything that could possibly help I will be eternally grateful! It's driving me mad!
I've done a precipitation recording experiment, and I have the data, but they need 3 examples of uncertainties, at least 1 systematic and 1 random. The 3 uncertainties I thought of are:
Wind affecting the level of water that goes in the pot, which could mean that the levels are either reduced or increased, but you cannot measure it, so it's a random uncertainty.
Rain splashing off the funnel, so less water and systematic uncertainty as I could prevent it by placing something on top of the pot to ensure the splashes go back into the pot.
and the pot falling over, which would be less water and a systematic uncertainty as it is just one loss of water, not a constant loss.
I have no idea if any of that is right, and I'm so bored of doing web research and being even more confused!
Any advice you can give would be seriously helpful.
Thanks!
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Never did much chemistry stuff but random uncertainty is generally to do with readings being slightly out each time u read them as we're only human(that's an example). I think ur examples sound alright though.
Me? I'm shocked. Shocked and stunned.
You cheeky sod!
I can help you. But I'll need the blood of an Irish virgin.
Oh Lindgren...yeah right!
Oh Lindgren...yeah right!
Loquacious Duck wrote:
> Ah, it's a bit clearer now.
>
> Sounds like your 3 are fine, but I'd say:
>
> Wind / Angle of rainfall - Systematic
> I'd say it would be possible to measure to some degree, you can
> measure wind levels, and you can predict how it's path, in relation
> to the angle of the opening of your container, could affect how much
> would go in.
Yeah, but then what would be a random uncertainty in that situation? Thanks for your help by the way!
> Ah, it's a bit clearer now.
>
> Sounds like your 3 are fine, but I'd say:
>
> Wind / Angle of rainfall - Systematic
> I'd say it would be possible to measure to some degree, you can
> measure wind levels, and you can predict how it's path, in relation
> to the angle of the opening of your container, could affect how much
> would go in.
Yeah, but then what would be a random uncertainty in that situation? Thanks for your help by the way!
Ah, it's a bit clearer now.
Sounds like your 3 are fine, but I'd say:
Wind / Angle of rainfall - Systematic
I'd say it would be possible to measure to some degree, you can measure wind levels, and you can predict how it's path, in relation to the angle of the opening of your container, could affect how much would go in.
Sounds like your 3 are fine, but I'd say:
Wind / Angle of rainfall - Systematic
I'd say it would be possible to measure to some degree, you can measure wind levels, and you can predict how it's path, in relation to the angle of the opening of your container, could affect how much would go in.
Sibs wrote:
> From what I remember:
>
> Systematic uncertainty is something you're doing wrong in the
> experiment, so every result is skewed one way (ie. if you had a ruler
> and took 1cm rather than 0cm as the starting point everytime, all
> your results would be less than they should be...)
>
> Random uncertainty is something that can't be prevented (and probably
> doens't affect every result)... I can't really think of a decent
> example of this one though...
Yeah, that sounds right, so with my 3 uncertainties, do you think I've picked the right ones?
> From what I remember:
>
> Systematic uncertainty is something you're doing wrong in the
> experiment, so every result is skewed one way (ie. if you had a ruler
> and took 1cm rather than 0cm as the starting point everytime, all
> your results would be less than they should be...)
>
> Random uncertainty is something that can't be prevented (and probably
> doens't affect every result)... I can't really think of a decent
> example of this one though...
Yeah, that sounds right, so with my 3 uncertainties, do you think I've picked the right ones?
From what I remember:
Systematic uncertainty is something you're doing wrong in the experiment, so every result is skewed one way (ie. if you had a ruler and took 1cm rather than 0cm as the starting point everytime, all your results would be less than they should be...)
Random uncertainty is something that can't be prevented (and probably doens't affect every result)... I can't really think of a decent example of this one though...
Systematic uncertainty is something you're doing wrong in the experiment, so every result is skewed one way (ie. if you had a ruler and took 1cm rather than 0cm as the starting point everytime, all your results would be less than they should be...)
Random uncertainty is something that can't be prevented (and probably doens't affect every result)... I can't really think of a decent example of this one though...
Loquacious Duck wrote:
> Evaporation?
That was the example they give, and they give it as a systematic uncertainty.
I haven't got my textbook with me that explains the difference between them but it's rubbish anyway, cos it doesn't explain it very well, I did some of my own web research and learnt a bit more but I thought maybe there'd be someone that had done a science degree that would know straight away whether I was right or not and would be able to explain why I'm wrong if I am!
I THINK the differences are that random uncertainties are something that you cannot prevent and cannot measure, whereas systematic uncertainties can be prevented to some level and you can pretty much measure the uncertainty?
> Evaporation?
That was the example they give, and they give it as a systematic uncertainty.
I haven't got my textbook with me that explains the difference between them but it's rubbish anyway, cos it doesn't explain it very well, I did some of my own web research and learnt a bit more but I thought maybe there'd be someone that had done a science degree that would know straight away whether I was right or not and would be able to explain why I'm wrong if I am!
I THINK the differences are that random uncertainties are something that you cannot prevent and cannot measure, whereas systematic uncertainties can be prevented to some level and you can pretty much measure the uncertainty?
Evaporation?
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