Classroom mode
Run it in class
Why does ice float?
Show of hands — before you project anything
Predict which of two equal-size cups is heavier, one of water and one of ice, then explain your reasoning before weighing.
- A Way more than you'd guess
- B About what you'd guess
- C Way less than you'd guess
Count the votes out loud. Hold them to it — then watch.
Project it (fullscreen)
Discussion prompts
- Predict which of two equal-size cups is heavier, one of water and one of ice, then explain your reasoning before weighing.
- Freezing adds no molecules and removes none, so how can a cup of ice weigh less than a cup of water?
- Predict what would happen to fish in a pond if ice were heavier than water and sank to the bottom each winter.
Where it shows up in real life
- An ice cube bobbing in a glass of juice or soda
- A frozen lid on a winter pond with fish still alive underneath
- An iceberg showing only its tip while nine-tenths hides below the waterline
A prediction-first worksheet — no answer key.
zero prep · no login · any projector
Winding down at home? Family mode ·
Explore every question
Why does ice float?
Predict — what do you think will happen, and why?
Talk about it
- Predict which of two equal-size cups is heavier, one of water and one of ice, then explain your reasoning before weighing.
- Freezing adds no molecules and removes none, so how can a cup of ice weigh less than a cup of water?
- Predict what would happen to fish in a pond if ice were heavier than water and sank to the bottom each winter.