Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading…
Transcript

Density and Buoyancy

Density and Temperature

Some fluids are denser than others.

According to the particle theory, particles in a substance move more quickly when energy (heat) is added. As a substance warms up, the particles move faster and further apart. This causes the volume to increase even though the number of particles stays the same. with the same number of particles in a larger volume, the density decreases. A substance generally has a greater density in a solid state than in its liquid state and gas state. There is one exception to this rule - WATER!!!!! Water is less dense at its solid state (ice) compared to its liquid state

Sink or Float

If you drop a grape into water, what happens? the grape will sink. However, if you drop the grape into corn syrup, it floats. Why does a substance float in some fluids, but sink in others?

  • If the density of a substance is greater than the density of the fluid, the substance will sink.
  • If the density of a substance is less than the density of the fluid, the substance will float.
  • If the density of a substance is the same as the density of a fluid, the substance will hover in place.

If all metals have a greater density than water, how is it possible for metal boats to float on water? The answer is - the boat consists of more than just metal. If you consider the density of the air inside the boat and the density of the other objects, you would find that the combined density of all parts of the boat is less than the density of the water.

Remember the submarine lesson - can someone explain how they work for me.

Why Ice Floats.

The particles in water move slightly farther apart as water freezes, so ice is less dense than liquid water.

Density and Temperature

Dense and Denser

A substance can have different densities, depending on its temperature. Notice when you swim on a lake the water at the surface is warmer than the water below. The warmer water floats on the colder water because it has a lower density than that of the colder water.

You also may have noticed the air in a room is warmer near the ceiling and cooler near the floor. The warm air has a lower density, so it rises above the cooler air that has a higher density. Or you basement is cooler than the main floor, or second level, the attic is just plain hot.

You have six identical jars full of different material. The jars contain - 1. water 2. sand

3. corn syrup 4. aquarium stones 5. shampoo

6. wood chips.

Instructions.

1. Without opening the jars, rank them in order of highest to lowest density.

2. What ranking did you choose? Explain your reasoning.

Learn more about creating dynamic, engaging presentations with Prezi