S E V ∆ F L ∆ V I T S FE M∆KE ∆ B∆ROMETER What kind of weather is your favourite? Weather comes as windy, cloudy, wet, cold, sunny and everything in between! But although you can’t feel it, air is squeezing on us from all directions. It goes up beyond the clouds making our atmosphere, and all that air is on top of us, creating air pressure which changes all the time. Air can absorb water, and how much water is in the air depends on temperature and air pressure - the higher the pressure, the more water can be absorbed. So when the air pressure goes from high to low, water in the air is seen as fog, mist, cloud or rain, and from low to high absorbs water gives clear cloudless sunny days. Barometers measure air pressure so are essential for forecasters. Lets make one so you can forecast the weather!
YO U W I L L N E E D : 1. 2. 3. 4.
2L milk carton Jam jar Sticky tape (Sellotape) Balloon
5. Pair of scissors 6. Piece of card, say 30cm by 1cm 7. Felt tip marker
46
