The steps are:
1. Take a bucket of water.
2. Find the mass of the cotton towel by weighing on a weighing machine. Let it be 'm' gram.
3. Now immerse the towel in the bucket containing water. Make sure it becomes wet
4. Take it out from bucket and again find the mass of wet towel. Let it be 'M' gram.
5. Find the percentage of water absorbed as:
% of water absorbed = (M-m)/m × 100
6. Now repeat steps 2 to 5 for silk and polyster towel.
7. Compare the % of water absorbed.