FUN IN SCIENCE EXPERIMENTS

It has been  observed  because  of  lack of  understanding  a large  number  of  students  lose interest  in  science  as they  grow  up. Science  can't  be  taught  by  merely  chalk & talk method. Experiments  is a must  for  developing  a  taste & understanding  in science. But  the  sad part  is  that  a large number  of schools  in our  country  lack facilities  for  Experimentation.

In ordered to  popularise science  and developing a  spirit  of  inquiry  in the  minds of  the  lerners hands- on experiments  is a must. It is  absolutely  a false notion  that  for  conducting  science  experiments  always  costly equipments and sophisticated  set- ups are nessary, infact the  reverse  is  true. 

Experiments  that will  be illustrated  in my  writing  will all be  suitable  mostly for school  students. May I  request  parents  or elders  whoever  reads  this  should  share with  their  children  and encourage  them  to  perform, observe & conclude.

   DANCING  NAPHTHALENE BALLS

 What  are needed  :

.  Soda water ( a bottle  of  any  soft drink)

.ordinary  tap water a dozen  of napnthalene balls

.Two glass tumblers

What  to do:

Take  4-5naphthalene balls and drop them  in  two tumbles/ glasses 

Pour water  in  one glass and soda water  in other. 

What  to observe:

.At first  all the  balls remain in sunk conditions  in  both  glasses

. After  some  time  napthalene balls in one of the  glasses  comes  up & goes down again.  I t appears as if they  are dancing. 

. Dancing  happens  as long  as  carbondioxide keeps coming  from  soda water. 

. Whereas in the  other  glass they  remain  sunk.ln soda water  carbodioxide gas comes  out  and rh

WHAT  IS  GOING  ON:

. Nathalie balls  in water  remain  sunk as they  are heavier  than water 

.whereas  in other  glass  carbon dioxide  sticks with  the  balls  & form bubbles  ,so their  volume  increases  they become  lighter  & floats up.

. When they  come up the pressure  on them  is  only atmospheric  pressure. 

. Whereas  when  they  were  at the  bottom  their  pressure  was atm+we. Of water  column

. Due to  this  sudden  reduction  in pressure  they  burst. & again  sink .

. This happens  as long  as co2 comes  out.

Prof. Samaresh Goswamy