Experiment?!?

Question

ok so i have 2 make an object that can sink in room temperature water 4 30sec nd then float baq up. u can makeup any item u want nd i pretty much tryed everything. i jst need ideas <3

thanx

Answer 1

You could make an object that sinks when it is cold and then the room temp water will warm it up and make it float.  Keep it on ice until your turn to go.  You could use an eye dropper with just enough cold water in it to make it barely sink.  Then when you put it in room temperature water, the air inside will expand and push some of the water out and make it float.  You&#039;ll have to play around until you get the 30 seconds.  Play with adding weight and using different amounts of water in the dropper.