Air is affected by Temperature

Transcription

1 4. Air is affected by Temperature How does a HOT AIR BALOON WORK? - Experiment: Hea?ng Air thre h"p:// content/se2/html/ StudentResource/source/topic_2/ pop_ups/zoom.swf he The greater the temperature, the faster the air particles move (increasing pressure), hitting the sides of the balloon more often and harder, making the balloon inflate more. The colder the air becomes though, the slower the air particles move (lowering pressure), resulting in the same amount of air now taking up less space. This is why the beach-ball you left in the garage over night will be smaller in the morning that it was during the day (when it was warmer).

2 be Compressed 5. Air canactivity: Air Powered Rocket Take a plastic pop bottle and with the cap off the Problem: What happens when you compress air? bottle, hold you hand above the mouth of the bottle Hypothesis/Prediction: 4/1/2016 and squeeze. Science Properties Air What do you feel? Screw the cap ofon tightlywith andwater, squeeze again. What completely replace the cap andhappens squeezewhen you - again. Experiment: Air- Powered ocket squeeze bottle now? RNow, fill the bottle What dothe you feel now? BOTTLE SQUEEZE!!!! Materials: THUS, GASSES SUCH AS AIR CAN BE COMPRESSED, BUT LIQUIDS SUCH AS WATER CANNOT! When you squeezed the open bottle, you forced -!string - tape - balloon - jumbowhen drinking straw some of the air out of the mouth. you placed the cap on the bottle and squeezed again, there was Variables:!! to Controlled:! no place for the air go, but you were able to!! Independent/Manipulated:! squeeze the bottle In! other words, you!! together. Dependent: were able to compress (or squeeze together) the air Procedure: Thread two short you (6cm)filled pieces straw onto the string. inside the bottle. 1.However, when theof bottle 2. Tie the length of string (about 5 m) between two points with water and capped it, you could not squeeze the 3. Attach an inflated balloon to the straw sliders with tape. Do not tie up the of the balloon. bottle very much!atneck all because you could not 4. Move the balloon jet to one end of the string. Let go of the neck and watch it compress the water inside.! rocket along the string. 5. Observe. What is powering this rocket?

3 6. Air is affected by Altitude h#p://howthingsfly.si.edu/media/buoyancy The higher you are, the lower the air pressure. There is less air above you to push the air down (which would increase the air pressure). This is why climbers on Everest use oxygen tanks - the air outside is too thin at the summit for them to breathe normally. Human bodies are used to air outside is too thin at the summit for them to breathe normally. Human bodies are used to air pressure. The air pressure in our lungs, ears and stomachs is the same as the air pressure outside of our bodies, which ensures that we don t get crushed. Our bodies are also flexible enough to EXAMPLE

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5 You ve probably also noticed that your ears pop during the take off or landing of a flight. This is caused by the difference in air pressure on either side of your ear drums and the only way to equalize the pressures is to yawn, chew some gum or breathing out while holding your nose.