Liquid Nitrogen - Revision history

imported>Stwikiadmin: /* Demonstration */

2016-11-17T20:28:33Z

Demonstration

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	''Please follow the link to the Molecule Dance demonstration write-up.''		''Please follow the link to the Molecule Dance demonstration write-up.''


	===Balloon===		===Balloon===

imported>Stwikiadmin: /* Demonstration */

2016-11-17T20:25:53Z

Demonstration

← Older revision		Revision as of 20:25, 17 November 2016
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	===Molecule Dance===		===[[Molecule Dance]]===

	~~''Note: This demonstration is great for younger audiences, but can be skipped for audiences in 9th grade or higher''~~

	~~# Call on several students to be volunteers. If it is a small assembly, you can have the entire assembly be volunteers!~~
	~~# Have them all stand close together, and start dancing. While dancing, they can move around, spreading out and taking up more space.~~
	~~# Have everyone stop, then tell them that they will all start "heating up". Have them start dancing again, but this time moving very quickly and taking up a lot more space.~~
	~~# Have everyone stop, then tell them that they will all start "cooling down". Have them move slowly, and try to huddle together, taking up very little space.~~
	~~# Have everyone stop, then tell them to go back to "room temperature". Let them move at their initial speed, and take up some space.~~
	~~# Have the volunteers all take a bow and return to their seats.~~

			''Please follow the link to the Molecule Dance demonstration write-up.''

	===Balloon===		===Balloon===
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	===~~Bimetallic Plate~~===		===[[Bi-Metallic Strip]]===

	~~# Show~~ the ~~bimetallic plate~~ to the ~~audience. Explain that the sides are Bronze and Nickel.~~		''Please follow the link to the Bi-Metallic Strip demonstration write-up.''
	~~# Put the bimetallic plate into the liquid Nitrogen. Ask the audience if a metal can get "more solid". Explain what happens.~~
	~~# Pull out the bimetallic plate after 10~~-~~15 seconds~~. ~~It will be curled over sideways!~~


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	##'''Do not throw it against a wood wall or wood floor'''; it will bounce off! If there are no sufficiently hard surfaces, then hold the ball on the green board, and hit it hard with the hammer to shatter it.		##'''Do not throw it against a wood wall or wood floor'''; it will bounce off! If there are no sufficiently hard surfaces, then hold the ball on the green board, and hit it hard with the hammer to shatter it.
	# Show one of the shattered pieces to the audience, and have a fellow presenter heat up one of the other pieces to show that it regains elasticity once it is warm again.		# Show one of the shattered pieces to the audience, and have a fellow presenter heat up one of the other pieces to show that it regains elasticity once it is warm again.


	== Why This Works ==		== Why This Works ==

imported>Stwikiadmin at 18:43, 16 May 2016

2016-05-16T18:43:50Z

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	{\| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"		{\| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"
	\| [[Physics]], [[Chemistry]]:		\| [[Physics]], [[Chemistry]], [[Biology]]:
	\| States of Matter, Properties of Matter		\| States of Matter, Properties of Matter, Cryogenics
	\|-		\|-
	\| Grade Range:		\| Grade Range:

imported>Stwikiadmin at 18:48, 9 May 2016

2016-05-09T18:48:28Z

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	;[[Physics]] ~~and~~ [[Chemistry]]: States of Matter, Properties of Matter		{\| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"
			\| [[Physics]], [[Chemistry]]:
	;Grade Range: [[Elementary School]], [[Middle School]], [[High School]]		\| States of Matter, Properties of Matter
			\|-
	;Format: [[Stage]]		\| Grade Range:
			\| [[Elementary School]], [[Middle School]], [[High School]]
			\|-
			\| Format:
			\| [[Stage]]
			\|}

			The Liquid Nitrogen demonstration is one of our most popular demonstrations to be requested. This demonstration requires a lot of practice before being performed, and volunteers must first go through the proper Cryogen Safety training before they are allowed to perform this demonstration.

	== Materials ==		== Materials ==

imported>Stwikiadmin at 17:43, 9 September 2015

2015-09-09T17:43:14Z

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	;Format: [[Stage]]		;Format: [[Stage]]

	~~'''''UNDER CONSTRUCTION'''''~~

	== Materials ==		== Materials ==

imported>Stwikiadmin at 16:07, 9 September 2015

2015-09-09T16:07:34Z

Show changes

imported>Stwikiadmin at 14:30, 9 September 2015

2015-09-09T14:30:22Z

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	;Physics and Chemistry: States of Matter, Properties of Matter		;[[Physics]] and [[Chemistry]]: States of Matter, Properties of Matter

	;Grade Range: [[Elementary School]], [[Middle School]], [[High School]]		;Grade Range: [[Elementary School]], [[Middle School]], [[High School]]
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	* Liquid Nitrogen		* Liquid Nitrogen
	* Thermos container for presenting		* Thermos container for presenting, with lid
	* Tongs		* Tongs
	* Balloon		* Balloon
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	* Ladle		* Ladle
	* Small Blast Shield		* Small Blast Shield
			* Cryo gloves and safety glasses/goggles

	== Safety Precautions ==		== Safety Precautions ==

	~~Science Theatre demonstrators must keep~~ the ~~safety~~ of ~~themselves and their audience~~ in ~~mind~~ at all times. ~~All Science Theatre demonstrators must have read through~~ the ~~Safety Training page. The ST Safety Box with first aid kit, fire extinguisher, etc. should always be available to demonstrators. Always wear safety~~ gloves, ~~glasses, and~~ a ~~labcoat if~~ handling ~~chemicals; always perform potentially dangerous demonstrations at a safe distance from the audience; and always keep a very close eye on~~ any ~~volunteers you call from the audience~~. ~~LIQUID NITROGEN CANNOT BE TOUCHED WITH BARE HANDS! KEEP AWAY FROM ANY BARE SKIN!~~		Please read the [[Demonstration Safety]] page section on Cryogenic Demonstration Safety. This demonstration requires the use of cryo gloves, as noted in the demonstrations below. When doing this demonstration, safety glasses or goggles are required at all times. Wear the cryo gloves whenever you are pouring liquid Nitrogen, carrying a liquid Nitrogen container or handling any object that has been submerged or exposed to liquid Nitrogen.

	~~A proper storage container is essential for transporting~~, ~~transferring, and handling liquid nitrogen. These arrangements~~ must ~~be discussed with~~ the ~~supplier~~. ~~Be sure not to store~~ the ~~liquid nitrogen in a container that can be sealed~~. ~~The container may explode and can possibly inflict injury~~. ~~Liquid nitrogen is stored in a Dewar~~, ~~which will keep it cold for long periods of time~~. ~~However, even in a Dewar, liquid nitrogen warms up and evaporates~~.		Before performing this demonstration, presenters must have completed the MSU Cryogen Safety form. One can access the form by clicking [http://www.aware.msu.edu/TRAIN/CRY/ here], or by visiting http://www.aware.msu.edu/TRAIN/CRY/.

	When working with liquid nitrogen, proper safety equipment MUST be used: safety goggles and thermal gloves must be worn at all times by all people working around the liquid nitrogen. It should be noted that most thermal gloves designed to work with liquid nitrogen will allow liquids to pass through them and saturate the material. Extreme caution should be exercised so that no liquid nitrogen contacts the gloves, as severe frostbite WILL occur.

	Liquid Nitrogen is many times colder than most people have experience with and they do not comprehend how cold it is. Be sure to take special care with liquid nitrogen around younger students. Never keep it within touching distance and never leave a Dewar of liquid nitrogen unattended. It should be explained to audiences that a trained person using safety gloves and goggles must handle liquid nitrogen carefully. NEVER use liquid nitrogen in a demonstration without gloves and safety goggles.

	Do not let students touch the ball or hoop after it has been taken out of the liquid nitrogen. Be extremely careful with the ball and hoop when using it in a glass (silvered or non-silvered) Dewar. You should NOT allow the hoop to come into contact with the Dewar sides or bottom. You may wish to consider performing this demonstration in a metal mixing bowl. This warning is advised for ANY metal object that needs to be placed in liquid nitrogen.

	The racquetball, flowers, bananas, and hot dogs should be handled by Science Theater performers only, and with thermal gloves at all times. Audience members may want to touch the pieces after the experience, but there is still risk of freezing-related problems. Feel free to show some of the pieces, but wear gloves at all times and tell the audience members to not touch. In addition, objects will shatter when broken. Consider breaking the objects behind a clear shield. Always keep the audience members a safe distance away.

	== Demonstration ==		== Demonstration ==
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	===Leidenfrost Effect===		===Leidenfrost Effect===

	''Note: This demonstration works best either right before or after the Banana & Flower demonstration. Do not perform this demonstration if you have not practiced it. Please use all necessary safety precautions before performing this demonstration''		''Note: This demonstration works best either right before or after the Banana & Flower demonstration. Do not perform this demonstration if you have not practiced it. Please use all necessary safety precautions before performing this demonstration.''

	# Show the audience your bare hand, and ask them why you wore a glove to handle the banana/Why you didn't wear a glove to handle the balloon.		# Show the audience your bare hand, and ask them why you wore a glove to handle the banana/Why you didn't wear a glove to handle the balloon.

imported>Morganp: /* Demonstration */

2015-09-09T03:36:04Z

Demonstration

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	# While wearing a cryo glove, stick the head of the flower into the liquid Nitrogen for 8-10 seconds. Pull it out, then tap it against the blast shield on the presenter's side. It will shatter!		# While wearing a cryo glove, stick the head of the flower into the liquid Nitrogen for 8-10 seconds. Pull it out, then tap it against the blast shield on the presenter's side. It will shatter!
	# Repeat the above steps, making sure to take time to explain each part of the demonstration.		# Repeat the above steps, making sure to take time to explain each part of the demonstration.


	===Leidenfrost Effect===		===Leidenfrost Effect===
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	# Hold your hand directly over the open thermos. Quickly submerge your hand in the container and pull it back out. repeat this process a few times, allowing time between dips to show that your hand is, in fact, intact.		# Hold your hand directly over the open thermos. Quickly submerge your hand in the container and pull it back out. repeat this process a few times, allowing time between dips to show that your hand is, in fact, intact.
	# Hold one hand directly over the thermos, and have the other holding the ladle. Scoop up a small amount of liquid Nitrogen with the ladle. Have the hand over the thermos open, tilted downward toward the thermos, and pour the liquid Nitrogen onto your hand. It will roll off your hand, and not hurt you!		# Hold one hand directly over the thermos, and have the other holding the ladle. Scoop up a small amount of liquid Nitrogen with the ladle. Have the hand over the thermos open, tilted downward toward the thermos, and pour the liquid Nitrogen onto your hand. It will roll off your hand, and not hurt you!


	===Bimetallic Plate===		===Bimetallic Plate===
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	# Optional: Bring the blowtorch with you. After showing what happens with the liquid Nitrogen, heat the bimetallic plate with the blowtorch. It will bend in the opposite direction!		# Optional: Bring the blowtorch with you. After showing what happens with the liquid Nitrogen, heat the bimetallic plate with the blowtorch. It will bend in the opposite direction!
	## ''Note: Do not put the hot bimetallic plate into the liquid Nitrogen. The rapid cooling could cause it to break!''		## ''Note: Do not put the hot bimetallic plate into the liquid Nitrogen. The rapid cooling could cause it to break!''


	===Racquetball===		===Racquetball===

imported>Morganp: /* Racquetball */

2015-09-09T03:35:18Z

Racquetball

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	===Racquetball===		===Racquetball===

			# Show the Racquetball to the audience, and bounce it a few times to show that it is elastic. Lock the tongs on it, and put it in the liquid Nitrogen. You might need to use the ladle as well to keep it submerged.
			# While the racquetball is cooling, explain what is happening to the audience
			# After 1-2 minutes, put on the cryo gloves and take the racquetball out. Drop it on the table to show that it has little elasticity, making note of what sound it makes.
	~~9. For Bimetallic Strip:~~		# If you have a back wall that is concrete or similar, throw the ball against the wall to shatter it. If the floor is concrete or there is a metal plate, throw it against it to shatter the ball.
			##'''Do not throw it against a wood wall or wood floor'''; it will bounce off! If there are no sufficiently hard surfaces, then hold the ball on the green board, and hit it hard with the hammer to shatter it.
	~~Present~~ the ~~bimetallic strip~~ to the audience and ~~explain~~ that is ~~a strip that has a different metal~~ on ~~each side (Bronze on one side~~, ~~Nickel on another). Dip the strip into~~ the liquid ~~nitrogen for a few seconds~~. ~~It is not necessary~~ to ~~cool~~ the ~~strip completely~~. ~~When~~ the ~~strip~~ is ~~pulled out~~, the audience ~~will notice that the strip bends to one side.~~		# Show one of the shattered pieces to the audience, and have a fellow presenter heat up one of the other pieces to show that it regains elasticity once it is warm again.

	~~10. For Racquetball:~~

	~~Convince~~ the ~~audience that~~ the racquetball ~~is flexible by bouncing~~ it ~~a few times~~ on the ~~floor. Using tongs~~, ~~place the ball in the liquid nitrogen and wait until the bubbling stops~~. ~~The racquetball takes~~ a ~~long time to cool down (about 5 minutes), so we suggest~~ that ~~you talk with the audience about what~~ is ~~happening to~~ the ball ~~or perform another demo while waiting. Remove~~ the ~~ball and try~~ to ~~bounce~~ it ~~away from~~ the ~~audience~~ or ~~into~~ a ~~shield~~. ~~The racquetball will break if~~ it ~~is thrown onto~~ a ~~hard enough surface.~~ If ~~you~~ are ~~in a gym~~, ~~you may need~~ to ~~throw~~ it ~~against~~ a ~~concrete wall (away from~~ the ~~audience)~~.

	==What to Say:==		==What to Say:==

imported>Morganp: /* Bimetallic Plate */

2015-09-09T03:27:36Z

Bimetallic Plate

← Older revision		Revision as of 03:27, 9 September 2015
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	===Bimetallic Plate===		===Bimetallic Plate===

			# Show the bimetallic plate to the audience. Explain that the sides are Bronze and Nickel.
			# Put the bimetallic plate into the liquid Nitrogen. Ask the audience if a metal can get "more solid". Explain what happens.
			# Pull out the bimetallic plate after 10-15 seconds. It will be curled over sideways!
			# Optional: Bring the blowtorch with you. After showing what happens with the liquid Nitrogen, heat the bimetallic plate with the blowtorch. It will bend in the opposite direction!
			## ''Note: Do not put the hot bimetallic plate into the liquid Nitrogen. The rapid cooling could cause it to break!''

	===Racquetball===		===Racquetball===