science and technology small production physics tools popular science training christmas romantic snowflake artificial snow super absorbent powder

usage:
just add water. the ratio of water to artificial snow is: 1:28 pour the material into the cup and pour water into it. in a moment, you can have pure snowflakes, and a small bag can get a large amount of snow. after its moisture dries, it will be collected and can be used next time.

what is artificial snow?
artificial snow is a magical absorbent resin that can turn water into a white fluffy substance that looks like real snow. this kind of snow is now commonly used in movies and interior decoration.
this kind of artificial snow is a chemical substance of polymer, which means long chain molecules (poly means many, mer means individual or molecule). artificial snow use its permeability to water (water molecules penetrate into it). when water molecules come into contact with the polymer, they expand from the outside of the polymer to the inside. the polymer chain is elastic, but it can only stretch to a certain length and cannot stretch again.

a teaching goal
 
1 understand the scientific name of super absorbent powder
2 able to use super absorbent powder to perform simple magic (disappearing water)
second, the focus of teaching
understand the physical characteristics of super absorbent powder and its application in life
this class focuses on performance and cultivates children's performance and expression ability.
three teaching process
 
1 super absorbent powder: full name water absorbent resin is a new functional polymer material. it has an absorption of several hundred
 
high water absorption function of thousands of times water, and excellent water retention performance
 
2 performance steps
 
a the props used are paper cups × 2 a small amount of super absorbent powder a small amount of clean water
 
b pour a small amount of super absorbent powder into a paper cup before performing, then stack two paper cups (there are super absorbent powder cups
 
put down) admission
 
c explain what is the magic to be performed? introduce the props. when introducing the props, you can under-cut the paper cup to prove that it is empty.
 
的
 
d pour another paper cup into a small amount of clean water and check whether it is ordinary water for the children.
 
e after checking, pour the water into the cup with super absorbent powder and shake it gently and say the magic spell you think about.
 
f shake for about 10 seconds and feel that super absorbent powder has absorbed water and slowly under-cut the cup after freezing. we will
 
found that the water in the cup was gone
 
four knowledge expansion
 
water absorbent resin is widely used and has a very broad application prospect. at present, its main use is still sanitary products (suction
 
water paper diapers, etc.)
 
because high water-absorbent resin has a large water absorption capacity and excellent water retention performance, it is super absorbent polymers as a soil
it has a wide range of applications in agriculture and forestry. if a small amount of superabsorbent sodium polyacrylate is added to the soil,
 
the germination rate of some beans and the drought resistance of bean seedlings can be improved, and the air permeability of the soil can be enhanced. in addition,
 
it can also be used as a new package due to its high water-absorbent resin hydrophilicity, excellent anti-fog and anti-condensation properties.
 
materials. the packaging film made by using the unique properties of super absorbent polymer can effectively maintain the freshness of food. in
 
adding a small amount of super absorbent polymer into cosmetics can also increase the viscosity of the emulsion, which is an ideal thickener.
 
taking advantage of the characteristics that super absorbent polymer only absorbs water and does not absorb oil or organic solvent, it can also be used as dehydrating agent in industry.

artificial snow-is a high-tech chemical product, which is small and granular. after absorbing water, its appearance is no different from that of real snow. it is white, crystal clear, and does not melt at high temperature. it feels cool and snowy, and non-toxic, harmless,. this product can also be used for mall counter decoration, christmas decoration, film and television, stage scenery, etc.