What possible sources of error could affect the accuracy of your calculated value of the amount of solid in your hand warmer?

There are numerous sources of error as to the acquiring of the amount of solid in the hand warmer. First, we have to be accurate first with the measurement. The inaccuracy from the measuring tool itself can be a factor.

Another thing is that the rounding off of the given measurements to their nearest numbers can also be a factor. The error may also be attributed to the human error.