10 Temperature Temperature & Scales Thermometry Thermal Expansion

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Presentation transcript:

10 Temperature Temperature & Scales Thermometry Thermal Expansion Homework 13, 20, 24, 45, 50, 58, 59.

Temperature T ~ KE/molecule Ex: hammered metal? Expansion with T increase 2 2

Superheating Mythbusters Instant coffee 3

Water Expansion Water expands from 4°C to 100°C (as does most materials) However, water contracts when warmed from 0°C to 4°C. (transient ice melting) 4 4

5 5

Ideal Gas PV ~ T Ex: V constant: P ~ T Ex: P is constant: V ~ T. Ex: T is constant: P ~ 1/V.

Constant Pressure What % increase in V occurs for an ideal gas heated from 20C to 40C? (V ~ T) (It does not double, b/c C is not a thermodynamic temperature scale) V2/V1 = T2/T1 = (273+40)/(273+20) = 1.068 6.8% increase in volume.

Linear Thermal Expansion DL = a Lo DT Example: 100C increase in Aluminum causes a fractional increase in length of 0.0024 = 0.24% change.

Bi-Metallic Strips

Summary T is KE/molecule measured in C, K, F. Gas Laws Thermal Expansion