# why do we calculate percent change in mass

Different parts of the potato might have different water potentials to start with. In order to overcome this, you could cut the strips out of the same part of each potato. Some strips might have 'skins. ' These would act as a barrier to reduce the rate of osmosis. You could replace these with strips without skins.

Ummmmmmmmmm. You might blot them before putting them in the solutions. Inconsistent blotting might lead to some strips being left with more excess water than others. In order to overcome this you could blot them gently and consistently in circular motions.

Control the volume of solution used for each strip. Anomalous results. you could do repeats and calculate the mean. Good luck!
Measuring only the changes in mass gives no information about the relative increases of the mass. If you have several repeats in your trial, every.

Measuring only the changes in mass gives no information about the relative increases of the mass. If you have several repeats in your trial, every individual has the starting mass of itself, and to measure only increases in mass may be misleading.

There is an exception: if you just follow the increase in mass of only one individual, percentual changes may not be important. I myself measure my body weight and it is more important to know if it drops from 85 to 80 kg than to know how many percents it has dropped.

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