density
Resources
PhET: Under Pressure
Explore pressure under and above water. See how pressure changes as you change fluids, gravity, container shapes, and volume.
PhET: Density
Why do some materials like wood float in water, and others don’t? Interact with blocks of different materials, including a custom option by modifying their mass and volume, to explore the effect on the density and discover the conditions for sinking or floating in water. Play detective to determine the material of each block by comparing its density with the values in the table.
PhET: Buoyancy
When will objects float, and when will they sink? Learn how buoyancy works and the forces involved by experimenting with objects, like blocks, materials with different shapes, a bottle with substances inside, and blocks in a boat, in a pool with a fluid that can be modified.
PhET: Buoyancy: Basics
When will objects float, and when will they sink? Learn how buoyancy works by experimenting with different blocks, modifying their volume and mass, and placing them in the pool with fluids of different densities. Analyze the forces generated when the block is inside the pool, and identify the variables that affect the buoyant force.
PhET: Balloons & Buoyancy
Experiment with a helium balloon, a hot air balloon, or a rigid sphere filled with different gases. Discover what makes some balloons float and others sink.