Nappy Science

We fused Science and Maths together to investigate the capacity of disposable nappies to hold liquid.  We decided to dye the water pale yellow so it would look more authentic.  The girls slowly poured water in small amounts of 200ml.  Their girls' nappy held 1,000mml or 1 litre before it overflowed.  The boys poured water in  larger 500ml amounts  They found that their boy nappy held 950ml before it overflowed.

Afterwards we shredded a nappy and found tiny crystals hidden in the fabric of the nappy.  We collected these crystals together into one plastic cup and left the other two empty.  Then we poured water into all three cups and switched them around.  Some people were unlucky and choose the wrong one - water poured out of the plastic cup onto their hair, but a few people choose the one with the crystals.  These had absorbed all the water and formed a white gel.  We enjoyed playing with this in our fingers - it felt cold and squishy.