Wednesday, September 23, 2015

Science: Lab Safety

First graders had a very special surprise last Friday. We got to practice science lab safety in a whole new way! Our Watch Dog Dad brought liquid nitrogen to school. He reminded us how important it is to wear gloves and protect our skin. With protected skin, our Watch Dog Dad, Ms. Mars, and the first grade teachers carefully placed a bouncy ball, roses, and more into the liquid nitrogen. We observed, what happened to each object when it was cooled to more than 300 degrees F below zero. The molecules were so cold they stopped moving and the objects become very hard solids. The objects all broke when hit on the ground and table.

When we were all finished with the objects, our Watch Dog Dad poured the liquid nitrogen onto the bus parking lot.  It was so cool to observe what happened when he did that.  

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