Question

What is physical interpretation of 20+-0.3

Answer 1

SO, 20 shows the calculated value of the given quantity.

And 0.3 shows the error in calculation.

This means there can be a negative or positive error of 0.3 in calculation of the given quantity.

Answer 2

Answer:

It is a way of expressing a measurement.

Explanation:

• Every instrument used for measurement has some probability of errors.
• Giving a precise answer is never possible on any scientific instruments used for predicting results.
• It has been wisely said " Better to be roughly right than to be precisely wrong".
• Measured quantities come with uncertainty of final result.
• Here, 20 is best estimated value whereas as 0.3 is the uncertainty pertaining in measurement.
• + and - refers to positive and negative error.
• 0.3 is the margin of uncertainty that is voluntarily mentioned here, either in positive error or negative error.
• True value of any measurement is given as:

measurement = (best estimate ± uncertainty) units