Day 96: What Happens When a Copper Wire Stretches?
In chemistry, I showed students a video of a long copper wire that stretches as weights are hung from the end. Then I asked students to draw what they thought was going on with the particles that make up the wire as the wire stretched.
We came up with several competing models:
the particles themselves became stretched out (on the left)
the space between the particles increases (also on the left)
the particles rearrange into a longer and narrower arrangement (on the right)
Here’s where I’m stuck: What can we do to test the different models to see what is actually happening?