Chapter 14 Heat and Temperature Notes
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1 Chapter 14 Heat and Temperature Notes Section 1: Temperature The degree of or of an object. Related to the of an object s atoms or molecules What makes something hot? o Particles that make up o They have o When you heat something the Kinetic Energy transferred as no matter what state they are in. Kinetic Energy Temperature Kinetic Energy Temperature Measuring Temperature - mechanical or electrical device for. Early thermometer was invented by. How thermometer works: o Most materials. o thermometers have a large bulb hooked to a narrow tube. o When the liquid. o Won t work if too or Metals when heated Different metals Hook two metals together to make a thermometer that turns Thermometers o Used in thermostats Limits on Temperature Upper Limit o. o Plasma found in = millions of degrees C Lower Limit o Definite limit called. o will slow down SO much, they will o Out of, so they get any colder Temperature Scales Three different scales: 1. Fahrenheit- 2. Celsius- standard 3. Kelvin- starts at but same degree size as Celsius In the US we know at water freezes and water boils.
2 Measuring Temperature The absolute temperature scale is called the. Absolute zero is. The melting point of ice is, and the boiling point of water is 373 K. There are numbers on the Kelvin scale. Converting Temperature Practice Problems: Temperature Scales 1. Water freezes at 32 F, what is this in Celsius? 2. Water boils at 100 C. What is this in Fahrenheit? 3. Lead melts at 600 K, what is this in Celsius? 4. Body temperature is 98.6 F, what is this in Celsius? In Fahrenheit? 5. Methanol boils at 75 C, what is this in Fahrenheit? Heat Heat is the transferred from one thing to another due Always moves from temperature to temperature. molecules (high temperature) hit molecules (low temperature) and tells you of heat transferring.
3 Section 2: Energy Transfer Heat can be transferred 3 different ways: 1. Conduction 2. Convection 3. Radiation Conduction Transferred of energy by Works well in some, then liquids, and. - materials that allow heat to pass through them Most - materials that don t let heat pass through them well Convection Transferring and are fluids When heated they, become less They, replaced by fluids Make a circular flow called a Radiation Energy transferred by Ex: infrared radiation,, ultraviolet rays Can travel through When wave hit object they make. Specific Heat Some materials Others require a to change their Specific heat measures the to raise the temperature Table on page 485 (Learn to use it) Water has a high specific heat of The amount of energy required to change the temperature of substance. Metals have a Calculating Specific Heat Energy = energy = cm T mass= kg energy= Joules Temperature= c=
4 Practice Problems: Specific Heat 1. How much energy must be transferred as heat to 200 kg of water in a bathtub to raise the water s temperature from 25 C to 37 C? 2. How much heat does it take to change the temperature of 3 kg of water by 75 K? 3. How much energy is needed to increase the temperature of kg of iron from 283 K to 403 K? Temperature vs. Time Graph Adding energy or, not both at the same time. Section 3: Using Heat First Law of Thermodynamics When thermal energy transfers as heat, it does so. The energy is. Whenever heat flows into or out of a system, the gain or loss of thermal energy. (You can t get something from nothing because energy and matter are ). Second Law of Thermodynamics Energy transfers as heat always moves from a. (You can t break even; you can t return to the state because always increases). is the tendency for natural systems to become. o Any system that is left to itself will fall apart. This means Entropy. o with every transfer or energy transformation.
5 Thermodynamics increases average is the process in which energy is transferred by work Heat Engines Heat engines to through the process of. Internal combustion engines inside the engine A is the part of the engine in which becomes. 4 strokes:, Compression,, and exhaust
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