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PIRA Class: 4C30.35
Purpose:
To observe the liquid-to-gas phase change of liquid N2.
Description:
Partially fill a small beaker with liquid nitrogen and place an uninflated balloon over the opening. The liquid nitrogen will boil and cause the balloon to expand.
Blow up balloons the easy way with a small amount of Liquid nitrogen.
1. Order Liquid N2 the day prior to the demonstration.
2. Pour Liquid N2 into a beaker. (Use the opportunity to discuss "boiling" and heat flow.)
3. Using thermal gloves to protect your hands, hold the balloon gingerly at its opening and pour a small amount of Liquid N2 into balloon.
4. Immediately pinch off balloon's opening & shake gently. Balloon will expand as the liquid N2 vaporizes within the balloon.
NOTE:
-You could also use a small funnel to aid in pouring the liquid N2 into the balloon
-Shaking the balloon gently as the liquid N2 vaporizes prevents any given portion of the balloon from freezing. BUT, if you would like a little bang to wake up students - try not shaking up the balloon - or add a little extra LN2.
Caution: ALWAYS wear eye protection!
Equipment:
Balloon, Liquid Nitrogen, thermal gloves, large beaker, goggles, funnel
Web Simulation:
Location:
Shelf 164 (balloon), 262 (beaker), 263 (funnel), 264 (gloves), liquid nitrogen near the sink
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