Is the glass full?

 It was another science magic show!

I showed three glasses; one empty, one half full of water and one glass full of pebbles.
I looked at each child, and asked, "Which glass is empty, which is half full and which is full?"  

 Each one had a turn pointing to the three glasses, empty, half full and full.
Our preschoolers were listening attentively as I explained the meaning of:
 a) Full - means the pebbles occupies all the space of the container or glass.
(b) Half - means the water occupies half of the space of the container or glass.
(c) Empty - means there is no water or pebble  in the container or glass.

"Is the glass containing marbles really full?"  I asked.  Everybody said "yes!"   

 "Let's see if it is full!"  I said challenging our presschoolers.  Each child took turns in putting a little salt, sugar and water into the glass full of pebbles. To our preschoolers surprise, the salt, sugar and the water went through the glass full of pebbles.

Each one looked into the glass full of pebbles very carefully.  "The water passes through the pebbles!" some children said in unison.  "The sugar and salt also passes through!  said another child. 

One child tasted the sugar and the salt.   "I like sweet.  I do not like salty!"

The glass was not full yet.  Each one added more salt, more sugar and more water!

The children put in more until the water with salt and sugar overflowed.   "The glass is now full!"  our children said in unison.

"Why?"   I asked, challenging our  preschoolers.   Everybody was quiet.  They were all looking through the glass.  After some time, each one agreed that they had filled in the spaces in-between the marbles with salt, sugar and water.  It made the glass containing marbles really full!

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