Jan 30th/31st

Do Now:
We went over the Density Review HW. I did not collect it as I wanted the students to have it to prepare for the test next week.

After the Review, we dove back into the Titanic, understanding why the boat floated and why it sunk.
Before:
- Mass was very high
- Volume was even higher
- When volume is larger than the mass, the overall density is less than 1, which is roughly the density of salt water.
- When the density is less than salt water, the boat will float.
- Boat was filled with air, which is extremely low in density and contributed to the average density being lower than water.

After:
- The water rushing in displaced the air that filled the boat.
- Water is has more mass than air.
- Mass increased as the water came in, therefore making the mass larger than the volume (which stayed the same).
- When Mass is larger than the Volume, the overall density is greater than one, which would cause the boat to sink.

Afterwards, we briefly spent time discussing hard numbers (total mass of boat, # of furnaces, # of passengers, # of lifeboats, and the # of people rescued).

Finishing up the day, we went back to the textbook to read two articles (Deadly Density and Air Heads). Deadly density spoke on the use of Chlorine gas in WW1 to aid in trench warfare. Chlorine gas is more dense than air, so the gas was used to fill the trenches where the soldiers were, knocking them out, making them easy targets.

Some of the info above is going to be used to measure the students understanding of density in the short answer response portion on the test next week.

Enjoy your weekend!