Define error? and its types also
Answers
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error is defined as:
"The difference between the measured value and the actual value."
If two persons use the same instrument for measurement for finding the same measurement, it is not essential that they may get the same results. There may arises a difference between their measurements. This difference is referred to as an "ERROR".
Types Of Error:-
Errors can be divided into three categories:
(1) Personal Error
(2) Systematic Error
(3) Random Error
Personal Error
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An error comes into play because of faulty procedure adopted by by the observer is called "PERSONAL ERROR".
Personal error comes into existence due to making an error in reading a scale. It is due to faulty procedure adopted by the person making measurement.
Systematic Error
The type of error arises due to defect in the measuring device is known as "SYSTEMATIC ERROR"
Generally it is called "ZERO ERROR". it may be positive or negative error. Systematic error can be removed by correcting measurement device.
Random Error
The error produced due to sudden change in experimental conditions is called "RANDOM ERROR".
For example:
During sudden change in temperature, change in humidity, fluctuation in potential difference(voltage).
It is an accidental error and is beyond the control of the person making measurement.
Atomic Mass
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Atomic mass is defined as :
"The mass of one atom of the element compared with the mass of one atom of C12"
Atomic mass is a ratio therefore it has no unit. Generally atoms mass is expressed in ATOMIC MASS UNIT(a.m.u).
One atomic mass unit is equal to 1/12 of the mass of a C12 atom.
Answer:
The difference between the observed the calculated value and true value is known as error.
Types of error :-
Gross errors or mistakes :-
Blunders
Computational errors
Chaotic errors
Systematic errors :-
Instrument errors
Environment errors
Determination errors
Constructional error
Random errors