Water preassure

 

MATERIALS:

- Clay

-Fish tank tube

-4 bottles

-fork

-tape

-2 ballons

STEPS:

First: cut one bottle in the bottom part leaving the up part , after that cut another bottle in the up part leaving the bottom part.

 

 

 

 

Next : cut 2 bottles in the up part and in the bottom part leaving the center of those 2 bottles ,after you cut all the 4 bottles then began to make 2 holes you only have to make the holes in the up part and in the bottom part.

Then : when you finish to cut the bottles and to makes the holes ,after that join the 2 bottles that cuted in the middle pasted withe the tape and then join the up part pasted and then join the bottom part
when you finish to join the bottles , cover around the holes with clay, after that insert the fish tank tube inside the holes but leave it in the middle before you inser it cut the fish tank tube in 10 cm ,after this blows the ballons for cut the air use the fork and then put thee up part of the ballon in the fish tank tube and then put it tape around it  you had to have it like this...

 





 

Finally: fill it with water and then  one of your ballons will have water inside and the another we desflates like this....