both chapters
Ch. 7~Key Concepts:
1. Fluids (p.192): A substance like liquids or gasses, that has the ability carry and hold materials
2. Properties of Fluids:
a. Mass (p.197): a measure of the amount of matter in an object.
b. Volume (p.197): Measure of how much space a substance takes up.
c. Thermal Expansion (p.200): Increase in volume in response to an increase in its temperature.
d. Thermal Contraction (p.200): The decrease in volume in response to a decrease in temperature.
3. Particle Theory of Matter (p.198):
a. All matter is made up of tiny particles
b. Particles are in constant motion
c. Particles of a pure substance are identical.
d. Temperature affects the speed at which particles move.
e. In liquids and solids, particles are close together because of the attraction between them.
f. In gases, the space between particles is greater
Uses of Fluids:
*1. Transporting Solids (p.193): (Example: making paper)
2. Slurry Technology (p.193): mixture of water and solids. (Example: Oobleck, cement).
3. Holding Other Materials (p.193):
a. Fluids can carry and hold materials. Example: Water in cells supports organelles for growth and replication. It also helps clean surfaces like marble, metal and teeth by holding abrasive particles.
b. Matter can be heated to fluid form so that they can be shaped and then cooled to become solids. Example: A slurry of water and cement is easy to transport. As it hardens, the cement can be shaped to become a smooth and level concrete sidewalk.
5. Other Uses:
a. Reducing Friction: e.g.oil is added to the engine of a car to decrease friction, and to reduce noise, heat, and wear
b. Preventing Rust: e.g. Paint is applied to iron to create a barrier that prevents rust from forming
c. Temperature Control: e.g. A fluid circulating in the back of a refrigerator that keeps the temperature cool
d. Compression: e.g. Some fluids, like gases, can be forced into a smaller volume, such as the air in a breathing apparatus for scuba divers
Technological Applications:
1. Submarines (p.191):
a. ballast tanks filled with seawater or compressed air to control buoyancy.
2. Cartesian Diver (p.191):
a). A Cartesian diver demonstrates how increased pressure compresses air inside the diver, making it denser and causing it to sink. Releasing pressure allows it to rise, which shows how pressure and density affect buoyancy.
Environmental Considerations:
️ impact of Fluid Technologies: Give examples of how understanding fluid properties can help solve practical problems.
Chapter 8: Viscosity, Density, and Compressibility
Key Concepts:
1. Viscosity (p.210):
A. Viscosity definition: The resistance of a fluid to flow
b. Flow Rate (p. 213): Measure of the speed at which a fluid flows from one point to another.
c. Temperature Effects:
i. Liquids (p.211): Viscosity decreases as temperature increases.
ii. Gases (p. 212): Viscosity increases as temperature increases.
2. Density (p.213):
a. Definition (p.213): Ratios of mass to volume (g/ml) with unit of measure
b. States of Matter (213): Solids are usually denser than liquids; liquids are denser than gases.
c. Temperature Effects (p.217): Density lessons as temperature increases.
3. Buoyancy (p.219):
a. Definition (p.219): the tendency of an object in a fluid to rise or sink due to density difference within its surroundings.
b. Archimedes’ Principle (p. 220): Archimedes’ principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
c. Factors:
i. Objects float if their density is less than the fluid.
ii. Objects sink if their density is greater than the fluid.
4. Pressure (p. 227):
a. Definition: Amount of force applied to a given area.
b. Depth Effects: Pressure in the fluid also changes with depth.
c. Fluid Flow: Fluids move from areas of higher pressure to lower pressure.
d. Temperature Effects: Pressure increases with temperature if the volume is constant.
5. Compressibility (p. 229):
a. Definition: The property of being able to be compressed
b. Gases: Easily compressed due to large spaces between particles.
c. Liquids: Incompressible due to little space between particles.
Practical Applications:
1. Hot Air Balloons (p. 208/209):
a. Rise when the balloon is heated
b. Sink when the air cools down
2. Density and Buoyancy (p.217):
a. Ships and submarines use buoyancy principles to float and sink:
Float: less water than oxygen.
Sink: more water than oxygen.
b. (p.221)Plimsoll line on ships shows how heavily a ship can be safely loaded in different water conditions.
3. Pressure Systems:
a. Weather balloons expand as they rise due to decreasing air pressure.
b. Fluids in devices like straws and syringes move from high to low pressure areas.
❌ c. Explain how this thermometer uses density to measure temperature