| Term | Definition |
|---|
| compress | to decrease the volume of an object without losing particles. |
| attentuate | increase the volume of an object without gaining particles. |
| volume | Amount of space something takes up. |
| Displacement of Water | When an object is immersed in water it takes the place of the water and adds weight. |
| mass | How much stuff an object is composed of. |
| vacuum | space with nothing in it |
| partial vacuum | space that is not completely filled |
| weight | an invisible gravity force between and attracting two objects. |
| Five | # of needles in the cluster of an eastern white pine. |
| Scientific views of air particles | 1. Air/gas particles are too small to see with our eyes. 2. Air/gas particles are in constant motion. 3. Air/gas particles are bumping into each other and every surface where they happen to be. 4. Air/gas particles exert a force. 5. Air/gas particles move faster and hit with more force when hot, and move slower and hit softer when cold. 6. There is empty space called a vacuum between particles. Space with hardly anything in it is called a partial vacuum. 7. Stuff like pollen, germs, and water vapor can get into a vacuum. This is how we can get colds or sneezes. 8. in outer space there are enormous vacuums with vast amounts of space between particles. 9. Matter is stuff. Stuff has mass that can be measured on a balance. Mass is affected by gravity. Without gravity all of our atmosphere would float away. Anything with mass also takes up space(volume). The amount of force that an object is pulled by gravity is called weight. Gravity becomes stronger with an object of more mass and with objects that are close together. 10. If air/gas particles are in a container then they take up all the space evenly. 11. When the volume is decreased and the mass stays the same the density of the air increases. 12. When the volume is increased and the mass stays the same then the density decreases. 13. Air/ggas particles do not have thumbs. 14. Air is a combination of many types of gases. There are many different kinds. Also if you have some oxygen you would not say, "Here is some air", because although all oxygen is air, not all air is oxygen. 15. Mass+volume can be measured in our lab. Density = mass divided by volume. |
| atmosphere | envelope of gases surrounding the Earth(10 or more gases). |
| unit label for volume. | cm3 |
| unit label for mass | grams |
| unit label for weight | lbs. |
| proof that air/gas particles are too small to be seen | we would be able to see them zooming around everywhere we went |
| proof that air/gas particles are in constant motion | can see if in a dark room with a beam of light over a certain area, wind |
| proof that air/gas particles exert a force | when we compressed them they pushed the syringe back to its original position |
| proof that there is empty space between air particles | smells would not be able to reach our noses without getting through the space between particles |
| proof that things can get into the space between air particles | pollen and bacteria travel through air to get from one person to another. |
| proof that matter has mass and mass is affected by gravity, which keeps us on the Earth | we don't float into space |
| weight on Earth=120lbs. | weight on moon=20lbs, because the moon has 1รท6th the Earth's gravity |
| procedure for finding the mass of air | found the mass of a 250ml flask with the air then remove the air and subtract the mass of the flask without the air |
| procedure for finding the volume of air | remove all the air from a 250ml flask. then put the flask under water and the water will take up the volume of the air removed |
| density | the amount of stuff in in a defined amount of space |
| formula for density | density = mass/volume |
| how to express a measure of density | amount of mas in 1ml or 1cm3 of space |
| density of air | .0012 in a space of 1ml |
| percent of nitrogen | 79 |
| percent of oxygen | 20 |
| percent of argon | .9 |
| percent of carbon dioxide | .04 |
| percent of neon | .0018 |
| percent of krypton | .0001 |
| percent of xenon | .0000087 |
| density of air | .0012 |
| density of nitrogen | .0012 |
| density of oxygen | .0013 |
| density of argon | .0017 |
| density of carbon dioxide | .0018 |
| density of neon | .0008 |
| density of krypton | .0037 |
| density of xenon | .0058 |
| If density of gas is greater than air | then the gas will sink through air |
| If density of gas is less than air | then gas will rise in air |
| density of water | 1g in a space of 1ml |
| density of floating block | .2 |
| density of sinking block | 1.2 |
| distinguishing characteristics of hemlock leaves | needles are flat, dark green on top with two white stripes on the underside |
| Maine state tree | Eastern White Pine |
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