Subject specific questions belong in the subject subforums - it's just that a lot of people post on the A-level forum and sometimes it doesn't end up getting moved.

Reply 9

username3156838

OP

9

Original post by _gcx

This is the right place :smile:

Subject specific questions belong in the subject subforums - it's just that a lot of people post on the A-level forum and sometimes it doesn't end up getting moved.

Oh okay thank you for your help

Reply 10

Sinnoh

22

Original post by _gcx

Calipers have an absolute uncertainty of

\pm 0.1 \text{mm}

and micrometers have an absolute uncertainty of

\pm 0.01 \text{mm}

.

not helpful

Wait - so calipers and micrometres measure down to 0.1mm and 0.01mm respectively - wouldn't that mean that the most that any reading could be off by is half that?

Reply 11

brainmaster

14

Original post by Imdad Kadir

What’s the absolute uncertainty of a micrometer and a vernier calliper

micrometer has resolution of 0.01mm and Vernier caliper has resolution of 0.1mm. for single measurements you use uncertainty of half resolution and if you have many readings then use uncertainty as half of range

Reply 12

username3156838

OP

9

Original post by Sinnoh

Wait - so calipers and micrometres measure down to 0.1mm and 0.01mm respectively - wouldn't that mean that the most that any reading could be off by is half that?

Original post by brainmaster

micrometer has resolution of 0.01mm and Vernier caliper has resolution of 0.1mm. for single measurements you use uncertainty of half resolution and if you have many readings then use uncertainty as half of range

Scienceshorts said that the uncertainty would be its resolution as you take two measurements when using something like a ruler and micrometer (one at beginning and one end). I’m not sure how true this is or what aqa says.

(edited 4 years ago)

Reply 13

brainmaster

14

Original post by Imdad Kadir

Scienceshorts said that the uncertainty would be its resolution as you take two measurements when using something like a ruler and micrometer (one at beginning and one end). I’m not sure how true this is or what aqa says.

maybe because I'm doing Edexcel and we use half of resolution but I've seen cases where they use resolution as the uncertainty so it could be correct

Reply 14

JammieDodger27

15

Original post by brainmaster

maybe because I'm doing Edexcel and we use half of resolution but I've seen cases where they use resolution as the uncertainty so it could be correct

It depends on the actual measurement. Its resolution if you have a potential error at both ends, its half the uncertainty if you're only measuring at one end

ITS only 0.01mm

what are the absolute uncertainties of the vernier calipers ?

Reply 17

veiki

1

what are the absolute uncertainties of the vernier calipers

Reply 18

veiki

1

what are the absolute uncertainties of the vernier calipers?

Reply 19

Emielt1849

1

UoM depends on your resolution and sometimes on these vernier scales you could break up the resolution in smaller divisions. 0.01 for example we say the smallest we can see with the eye on vernier scale is 2.5micrometer. And when calculating the uncertainty it calculates to minimum of 2microns. Best case with no errors. thus stdev is zero. Well maintained temp. etc.

[Question] What’s the absolute uncertainty of a micrometer and a vernier calliper

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