Question

A volumetric pipette has an uncertainty of 0.01cm3. What are the lowest and highest possible volumes for a measurement of 0.20cm3?

Answer 1

Answer:

Possible lowest volume = 0.19 cm

Possible highest volume = 0.21 cm

Explanation:

given data

volumetric pipette uncertainty  =  0.01 cm³

total volume = 0.20 cm³

solution

we will get here Possible lowest and highest volume that is express as

Possible lowest volume = total volume - uncertainty   .....................1

Possible highest volume = total volume + uncertainty    ....................2

put here value in both equation and we get

Possible lowest volume = 0.20 cm - 0.01 cm

Possible lowest volume = 0.19 cm

and

Possible highest volume = 0.20 cm + 0.01 cm

Possible highest volume = 0.21 cm

Answer 2

The lowest and highest possible volumes of the pipette measurement is the slight change in the measured value due to the error value. Hence, the lowest and highest possible values are 0.195cm³ and 0.205cm³ respectively

Given the Parameters :

• Measurement uncertainty = 0.01 cm³

• Error = uncertainty value /2 = 0.01/2 = 0.005 cm³

• Measured volume = 0.20 cm³

Possible values = measured value ± Error

Lowest possible value = 0.20 - 0.005 = 0.195 cm³

Highest possible value = 0.20 + 0.005 = 0.205 cm³

Therefore, the lowest and highest possible values are 0.195cm³ and 0.205cm³ respectively.

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