A student investigated the change in mass of sweet potato cylinders placed in a sucrose solution for one hour. Their results are shown in the table below.
| Sweet potato cylinder | Mass at start in grams | Mass after one hour in grams | Change in mass in grams |
|---|---|---|---|
| A | 3.5 | 3.1 | -0.4 |
| B | 3.6 | 3.3 | -0.3 |
| C | 3.4 | 3.0 | -0.4 |
Give two ways that this method could be improved to obtain more accurate results.
