Science Fun

 We've had some fun with science this week.

One day we experimented with different ways to make invisible ink.  We tried milk, baking soda, and lemon juice.  The kids wrote on these papers with milk and lemon juice.

We warmed them in the oven to reveal their messages!

We decided that the milk worked best.  The baking soda worked really well, too, but you had to use grape juice to reveal the message.  That was too messy for my taste, so we only did that once.  It was probably the coolest one, though.

Yesterday we experimented with a candle.  In the first experiment we created CO2 (which suffocated the flame) by putting some baking soda in the cup with the candle and then adding vinegar.

The second experiment dealt with air pressure, temperature, and again oxygen (or the lack thereof).

I didn't realize this picture was blurry until now.  Oh well.  The change in air pressure when the candle went out and the air cooled sucked the water into the cup.  The kids loved this one.  We did it over and over.

Today we made 'gak' with glue and borax.  The kids have been playing with it all day.