January 30 Notes
January 30 Notes PHYS 102
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This 1 page One Day of Notes was uploaded by Chloe Smithson on Friday January 30, 2015. The One Day of Notes belongs to PHYS 102 at University of Oregon taught by Shahir in Winter2015. Since its upload, it has received 178 views. For similar materials see Fundamentals of Physics in Physics 2 at University of Oregon.
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Date Created: 01/30/15
Plasma Plasma is the fourth state of matter that consists of an electrified but neutrally charged gas with positively ionized atoms and a corresponding number of electrons This is the least abundant in our immediate environment but the most in the universe as the sun and stars are made of plasma In our lives we see plasma within the Northern and Southern lights where charged particles get stuck moving in the magnetic fields in the upper atmosphere We also view plasma in neon signs and fluorescent lamps in which high voltage causes electrons to flow ionizing atoms which forms plasma A plasma TV is composed of thousands of pixels with three colors in each pixel Each color is from a different gas and the television sends different voltages to each pixel depending on the colors needed to display the image Temperature Heat Expansion Temperature is the number that corresponds to the warmth or coldness of an object measured by a thermometer Temperature is defined by the kinetic energy per particle in a substance Temperature has no upper limit but a definite lower limit called absolute zero at which all motion stops Athermometer measures temperature by expansion or contraction of liquid often mercury or dyed alcohol However mercury is not often used anymore due to it s toxicity Celcius is a unit of measurement for temperature named after Anders Celsius in which 0 degrees Celsius is freezing point of water and 100 degrees Celsius is the boiling point of water Fahrenheit was named after G D Fahrenheit and marks 32 degrees as freezing point of water and 212 degrees as boiling point Kelvin uses 0 as absolute zero 273 K for freezing 373 for boiling This scale is Celsius 273 Heat is internal energy transferred from one substance to another Heat is always transferred from a high temperature body to a low temperature body until equilibrium is reached Heat is never transferred from low to high
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