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Tuesday, September 15, 2009

Physics----Temperature & Heat

Energy flow from high temp to lower temp.Lower tem will gain heat while high temp loss heat....
it continue until both have the same tmep.Same temp is called Thermah Equilibrium which mean no energy flow..........

COMMON SCALES

Fahrenheit degree F & Celcius degree C.

Change between temp(deta T) is specified as Celcius degree, C degree.

converting------
fahrenheit=32+ 9/5 celcius
celcius=5/9 (fahrenheit-32)
kelvin=celcius+273.15

THERMAL EXPANSION

Linear--:
deta L = a L(initial) C degree

overflow is calculated by determined what material that been overflew and minus with deta T of another substance.

Volume--:
deta V = B(beta) V(initial) C degree

C degree and Kelvin just the same.if the question gives temp in kelvin,just use it and don' need to convert to C degree.

SPECIFIC HEAT CAPACITY

Q=mC deta T

Q=heat, m=mass , deta T= temp change(final - initial)

LATENT HEAT

Fusion = solid to liquid
Vaporization = liquid to gase
Sublimation = solid to gase

Q=mL

Q=heat, m= mass, L=latent heat

Differentiation between Q=mC deta T & Q = mL

Q = mL occur when there is a change in the phase for example ice become water,otherwise use Q=mC deta T.Both can be used together,based on the question...

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