A source of error is any factor that may affect the outcome of an experiment. There are countless conceivable sources of error in any experiment; you want to focus on the factors that matter most. Identify each source of error specifically and then explain how that source of error would have affected the results. Keep in mind that an "error" to a scientist does not mean "mistake"; it more closely means "uncertainty".
Many students are tempted to say "human error", but this term is vague and lazy; any decent teacher will not accept it. Instead, think about specific things that happened during the lab exercise where the end results may have been affected.
To give an example one might find in a bio lab: perhaps a water bath's temperature was not monitored very carefully and you found that an enzyme's activity was greater than you expected. In that case, you could write something like,
"The temperature of the water bath during this exercise was not monitored carefully. It is possible that it was warmer or cooler than intended, and this would have affected the enzyme activity accordingly. The fact that our enzyme activity was found to be higher than expected leads me to believe that perhaps the water bath was too warm."
Traces of Impurities from the last substance tested. The position of the wire, too low and you won't get an accurate result. How long the wire is kept in the fire, how strong the fire is.
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What are some precautions and source of error in the principle of moments
taking the measurements
suggestion of the improvement in experiments magnetic flux?
In the simple harmonic motion experiment; the equation neglects both gravity and air resistance. Furthermore, depending on your method of obtaining the spring constant (k); the measurements will most likely not be accurate if the method in the lab manual is used. A meter stick is inefficient to measure in mm by simply holding it straight up.
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What are the sources of error in a solubility lab containing potassium crystal
The most common sources of systematic error in a titration experiment are errors in calibration. The concentrations of substances used could be incorrect.
What are some precautions and source of error in the principle of moments
this is important to be her formula is correct.
taking the measurements
Energy loss due to leaks in the calorimeter
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suggestion of the improvement in experiments magnetic flux?
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3 main sources of error would be first that the cup is not closed and therefore a lot of the heat would not be kept in the cup. Also the pellets could have been either too hot or too cold when they were placed in the cup.
Measurements are off because the tool used isn't precise. Temperature and humidity may affect the results. Errors like miscalculations and reading scales incorrectly don't count as a lab error and would be a human mistake. For a formal lab, you shouldn't include these types of errors on your part.