| PROVING AIR EXPANDS BY A SIMPLE EXPERIMENT |
| YOU WILL NEED: A SALINE BOTTLE WITH ONE HOLED RUBBER CORK TIGHTLY FITTED, A USED BALLPEN REFILL REMOVING THE METAL POINT AND SOME COLOURED WATER. |
| TAKE SOME LITTLE WATER IN THE REFILL BY CLOSING ONE END OF THE REFILL AND INSERTING IT INTO THE RUBBER CORK SUCH THAT THE COLOURED WATER IS VISIBLE IN THE MIDDLE OF THE REFILL. NOW RUB BOTH YOUR HANDS AND PLACE THE HEAT OVER THE BOTTLE. THE LEVEL OF WATER WILL MOVE UP SHOWING AIR EXPANDS WHEN HEATED. |
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