Washing & drying carrots
With all items gathered in one place, wash the carrots with cold water and cut their stems. Put them where they can dry quickly and completely.
Weigh the carrots
After the carrots have dried, put them on a kitchen scale to measure the weight and note down the reading.
The wax paper
Now take a piece of wax paper, weigh it and note down the reading as it will be used later in the experiment.
Re-weigh the carrots
After two days, weigh the carrots again. Make sure you subtract the wax paper's weight from the total.