TEN LITTLE FINGERS - Arvind Gupta

VOLUME20ml.1. Dip a little cotton ball in oil and rub it on anordinary matchbox drawer. Soon the wood /card of the matchbox will absorb the oil. Oilingmakes the drawer water proof.3. Stick a strip ofwhite paper alongthe length of a bottle.Now, fill the matchboxdrawer withwater and pour it inthe bottle. Mark aline on the stripindicating 20 ml.2. This drawer when filled with waterholds approximately 20 ml of water.The drawer can be used as a roughstandard for measurement of volume.4. Add moredrawers full ofwater and similarlymark thelevels of 40 ml,60 ml, 80 ml and100 ml. You candraw a linemidway between40 and 60 toindicate 50-ml.5. This bottle now becomes a graduatedcylinder for measurement of volume. Fill thebottle upto the 100 ml mark and then pour itout in a big pan. Repeat this ten times. Nowthe water in the bucket will be 1,000 millilitresor 1 litre. You can also use old mineral waterplastic bottles for measurement of volume.Conservation of Volume6. Put an exact cupful of water into each of thevarious pots, jugs, jars, bottles and other utensils.Now it will be difficult to tell that there is the sameamount of water in each because the sizes and shapesof the vessels are so different.Ask your friend to tell you the ways in which thevessels with water are alike. This time there areseveral ways in which they are similar:1. They are all containers.2. They all contain water.3. They are all waterproof.4. They all contain the same amount of water.