States of MatterChapter 13

Understand and Utilize PRESSURE of a Fluid P = Force /AreaExpansion and Contraction of matter caused by changes in Temperature

Ideal Gas Law PV =nRTCombined Gas LawP1V1 /T1 = P2V2 /T2

Boyles Law (const T) P1V1 = P2V2

Charles Law (const P) V1 /T1 = V2 /T2

Utilize PASCAL – BERNOULLI – and ARCHIMEDES Principles

Ideal GasesIdeal Gas Law PV =nRT Combined Gas Law P1V1 /T1 =

P2V2 /T2

Boyles Law (const T) P1V1 = P2V2

Charles Law (const P) V1 /T1 = V2 /T2

Pressure - AreaP = Force /AreaF1* A2 = F2* A1

Hydraulics

When Bad Tanks go Bad

Pressure Builds

The Boston Molasses Disaster, also known as the Great Molasses Flood and the Great Boston Molasses Tragedy, occurred on January 15, 1919, in the North End neighborhood of Boston, Massachusetts in the United States. A large molasses storage tank burst, and a wave of molasses rushed through the streets at an estimated 35 mph (56 km/h), killing 21 and injuring 150. The event has entered local folklore, and residents claim that on hot summer days, the area still smells of molasses.[1]

The collapse unleashed an immense wave of molasses between 8 and 15 ft (2.5 and 4.5 m) high, moving at 35 mph (56 km/h), and exerting a pressure of 2 ton/ft² (200 kPa).[6] The molasses wave was of sufficient force to damage the girders of the adjacent Boston Elevated Railway's Atlantic Avenue structure and tip a railroad car momentarily off the tracks. Nearby, buildings were swept off their foundations and crushed. Several blocks were flooded to a depth of 2 to 3 feet (60 to 90 cm).

Pascal and ArchimedesPascal's PrinciplePressure is transmitted undiminished in an enclosed static fluid.

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Archimedes' PrincipleHmm! The crown seems lighter under water!

Buoyancy Pressure = Fg / AFluid Pressure = ρ h gF Buoyancy = (ρ Water )(Vol)(g)

Equal Volumes Feel Equal Buoyant Forces

Pressure.mov

Bernoulli Equation

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LIFT

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