Which issue of Happy Camp has this experiment?

Happy Camp has the number of issues of "scientific experimental station":

212421 launching ceremony: dry ice cake, dry ice balloon, liquid nitrogen cannon

212428 human piano, hearing test, fruit DJ stage

21255 sulfur hexafluoride: extinguishing candles and carrying boats. Introduction of Bale, Angel Wall

212519 gas: blowing candles, smoke cannons, jumping out of boxes to extinguish candles, hydrogen explosion

212526 one-handed flying eggs, light bulb nailing

21269 force dispersion: plastic cups and cones (1262)

212. Portrait painting

Wulin competition in p>212639: chopping wood with one hand, keeping the bottle still, flying wood with a quick sword

standing coins in p>212728, standing bottles, foam Zhao Zhouqiao

buffering in p>21284, starch pool, liquid nitrogen biscuits

beating egg whites and making bubbles in p>p>212818. Three rounds of challenges: button tightening, spearfish balls, firewire impact

212825 rainbow circle, liquid nitrogen ice cream, dry ice candle

21291 air pressure: balloon shooting, air cannon, celebration ceremony

212915 detergent painting, running karting boat, super smoky drum

212925. Magic sucker big test

212929 pressure

21216 * * vibration

21212 angular momentum conservation principle

21213 Bernoulli principle

2121117 water surface tension

2121 buffer

Friction electrification

conservation principle of angular momentum in p>2121215

inclined plate in p>213112, friction force in Woodenhead in p>213119

lemon electrification in p>21322, air pressure in p>p>21333, Variety New Year Competition: speed competition, graceful competition: balloon blasting

Taking photos regularly

The pressure of rubber bands in p>21346 and the competitive rankings in the entertainment circle: high jump, single-shoulder wrestling

human tires in p>21361, going through four customs

small balls going uphill in p>213622, fighting against the sky

corrosion in p>213629

liquid nitrogen in p>213713, guessing. Magic water cup

21381, hands-on, paper boat, paper boat going through three customs

21397, waterproof, goddess KTV

213921, sound transmission: experiment of breaking cups and musical instruments underwater

2135, power

21312, electricity, barbecue. Parent-child version has a heart

2131123 issue of electronic music guessing song, liquid nitrogen cannon

21313 issue of electrostatic version of firewire impact

2131221 issue of static electricity: electrostatic version of firewire impact

2131228 issue of centrifugal force, centrifugal force shooting, Make A Wish

21314 issue of vacuum, vacuum version. Wedding

21438 Bom Bom Change, Air cannon penalty shoot-out

214315 molecular cooking

21445 rubber band riding weight (1431)

214419 balloon

214426 ice cream relay

21453 travel hungry cooking competition

2145. Environmental protection robot contest and hurricane electric fan

214628th Nano: Honest Sister Magic Time, Mud Paint Battle

214726th Inertia: Pulling tablecloth, Racing Challenge

21482nd Stick Needle into Water Bag

214823rd Wrong Dance

21483th Taste Test. Dressing at high altitude

214118 Bubble: Magic Bubble Tree

21418 Arch Structure: Foam Zhao Zhouqiao

214115 Mechanics: Inclined Coke, High-altitude Battle

214126 Bearing: Cylindrical dictionary, honeycomb structure: waterproof paper chair bearing

2141216. Needle-board Balloon

21511 Center of gravity: Dismantling building blocks: Large-shape wood-pulling experiment

21527 Same-sex repulsion: digital bomb

215214 Memory metal: prediction

215321 quickly wash off 52 glue

21544 Item magic: digital bomb.