Mix & Flow

A fluid is a anything that doesn’t have a fixed shaped and can flow.

Some gases at certain temperatures adhere to this definition

Fluids often transport something.

Log drives, O2 & CO2 in blood, sewage, slurpees

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Classifications

• Matter - pure substances and mixtures
• Mixtures - Mechanical, solutions and suspensions

Suspension (colloids)

• Solids carried by a liquid.
• Often kinetic energy is involved in the buoyancy
• Often settles in time

Colloids

• A suspension, but particles are so small, they never settle.
• Milk is a colloid
• Foam is a colloid

Pure Substances & Mixtures

Pure substances are elements. You can’t separate them anymore. Anything else is a mixture.

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Mechanical mixtures - think gravel.
Heterogeneous too.

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Water is considered the universal solvent (all other solvents are jealous).

Homeopathy is a very questionable
treatment involving increasingly lower concentrations of solute in solvent.
To the point when there is a higher concentration of solute in tap water.

Saturation - when no more solute can be dissolved (the opposite of homeopathy).

Unsaturated- when more solvent can be dissolved into the mixture.

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Types of Solutes/Solvents

• Air - which is the solvent?
• Coke - what is the solute?
• Vinegar - the solute is?
• Bronze - is an alloy of?

Heating things makes blending easier

• It’s easier to convince tea or coffee to mix with water.
• It makes space for it.

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Can you simply add

Particle Model

• Different states determine their density
• These bits can be attracted, bonded or free
• Much of this model is wrong.

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What is water displacement?

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Density = mass/volume

As temperature alters density, the bouyancy of a thing changes with both temperature and the solution it’s in.

Hot air balloon & high pressure day, boat in salt water

How does your vest change your buoyancy?