If a dozen nails are left in an open dish to rust, what do you think the mass of these 12 nails would be now? less, more or the same?

Cumulative results collected from students attending the Science Roadshow:

 

1572 Less
1934 More
1369 Same

Teacher's Notes

Teacher guide for Curiosity Probe: The Rusty Nails.

The Rusty Nails