PHYSICAL PROPERTIES OF FLUIDSViscosity and compressibility

PREDICTION Predict what will happen when we put a few drops of dish

detergent in the middle of the milk mixture, with out stirring or mixing.

ObservationWhat's happening?

Come up with possible explanation to the milk magic phenomena.

WHAT HAPPENED??

HERE IS WHY…

So you know where the color comes from, but why milk and liquid soap? The main job of dish soap is to go after fat and break it down. Usually the fat is on dishes from the food we eat, but fat is also in whole milk. When you drop the liquid soap onto the tray, it tried to break down the fat in the milk. While it was doing that, it caused the colors to scatter and mix creating a very colorful display.

But what is breaking down the fat??

MOLECULES!

Soaps or detergents are made up of molecules that are polar on one end and nonpolar on the other. They allow these two types of molecules to interact. The nonpolar end attaches itself the the lipids, or fats, in the membrane and then the other end is bound to moving water, that pulls the membrane apart.

HOW DID THE DIFFERENT DETERGENT BRANDS REACT?

Each brand has a different solution with different molecules causing unique reactions between the cell membranes/ fats and detergent molecules

VOCABULARY Buoyancy: the ability or tendency of something

to float in water or other fluid Density: the degree of compactness of a substance Flow rate: the volume of fluid which passes through a

given surface per unit time Friction: the resistance that one surface or

object encounters when moving over another. Pressure: continuous physical force exerted on

or against an object by something in contact with it.

Compression: the reduction in size of data in order to save space or transmission time

Viscosity: the state of being thick, sticky, and semi-fluid in consistency, due to internal friction.

VISCOSITY

Think! What other products is this property important in?

Paint? Hand lotion? Condiments? Motor oil?

WHY IS VISCOSITY IMPORTANT IN THESE PRODUCTS?

Viscosity is important because it covers a variety of different physical attractions. For example, the flow rate of the material is determined by its viscosity.

Viscosity is an important factor in chemistry, industry, and many types of manufacturing practices. The viscosity of a substance determines how it should be handled, stored, and discarded. For instance, you would not want to store a viscous substance like honey in a container with a very narrow and long tip because it will be very difficult to remove the honey from the container.

PRESSURE AND TEMPERATURE ON LIQUIDS AND GASES

http://www.youtube.com/watch?v=AFARWpoaSJA

EXTERNAL PRESSURE ON GASES

Think of squeezing a balloon. What happens when there is external pressure?

Volume Changes!

EXTERNAL PRESSURE ON LIQUIDS Think of a medicine in a needle. What

happens when the syringe puts pressure on the liquid?

Volume changes!

WHAT IF VOLUME REMAINS?

When you increase the pressure and compress the molecules they start to move faster and that raises the temperature.

Connect to the video. When steam was not released the temperature increased more!

EXIT SLIP!

Answer the questions on the slip and hand in before you

leave!