Behavior of Gases

Behavior of Gases - PHY 221 Lab#1 Introduction to...

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PHY 221 Lab 11 Behavior of Gases Leader: Critic: Scribe: Goals : Gases are all around us, literally - without air, we couldn't live. From a physics point of view, air at room temperature is a pretty good approximation to an ideal gas. Chemically, it is a mixture of nitrogen (N 2 molecules, 78% by volume), oxygen (O 2 molecules, 21% by volume), and tiny amounts of lots of others. In this lab, we'll explore a few properties of ideal gases in general and air in particular. Helium is our best example of an ideal gas. Some things about gases are best learned when you turn gas into a liquid, so liquid nitrogen and liquid oxygen will be part of our studies as well. Materials: Balloons Cylindrical plexiglass box with holes in both ends Paper clips Balance Bottle of helium Large and small dewars of liquid nitrogen Graduated cylinder partly filled with water Balloons pre-filled with pure oxygen Rulers Oxygen liquification apparatus: conical metal can on adjustable stand, glass beaker, tray for liquid nitrogen Magnets Safety gear for working with cryogens: safety glasses, tongs, insulating gloves Page 1 of 12 PHY 221 Lab #1: Introduction to Measurements 12/28/2009
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Important Safety Warning In this lab you will work with liquid nitrogen and liquid oxygen. Boiling o F. If it splashes on your skin it will boil intensively creating a protective gas layer around the cold liquid. This is unlikely to hurt you unless the contact is prolonged. You should keep your body parts away from these liquids. Use tongs to handle balloons that you will submerge in the cold liquid. Other materials in contact with these liquids, e.g. glass biker, get very cold too. Do not touch them with your bare hands, as you can get severe frostbite. Use protective gloves.& Perhaps the most dangerous is a splash of cold liquid into your eye. Since the cold liquid can mix with natural liquids in your eye, thermal contact is more direct than with your skin, thus you can even lose your eye. It is absolutely necessary that your wear protective glasses. In this lab, there is no room for &jokes& and irresponsible behavior. Any violations will be punished by failing grade on entire course. You will be also kept responsible for any harm you may cause to your peers.&& We have fewer stations than lab groups today, so your group may need to join with another at various times. Circulate from one station to another in any order. Activity:
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Behavior of Gases - PHY 221 Lab#1 Introduction to...

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