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Chapter 9
Heat
| Question | Answer |
|---|---|
| What direction does heat flow? | From hot to cold. |
| What is the thermal energy of a system? | It is the sum of all the kinetic energies of its particles. |
| Thermal energy can only be measured as it is ___________ from one system to another. | Transferred |
| Transferring particle energy, the motion, is called _________ and __________. | Heating,Cooling |
| A loss of thermal energy is usually accomanied by __________ temperatures. | Falling |
| A gain of thermal energy is usually accompanied by ___________ temperatures. | Rising |
| The temperature of an object is directly related to the _________ kinetic energy of its atoms and molecules. | Average |
| What was created by Gabriel Fahrenheit? | The Fahrenheit scale. |
| Gabriel Fahrenheit later changed the fiducial points to the __________ point and __________ point of pure water. | Freezing,Boiling |
| In 1742 Anders Celsius devised what?= | A decimal temperature scale. |
| In 1848 Lord _________ proposed a temperature scale in which the lowest temperature would be Absolute 0. | Kelvin |
| The freezing point of water is ____ K. | 273 |
| The advantage of the Kelvin scale is that there are _____ negative values. | No |
| Celcius == | 5/9(Fahrenheit -32) |
| Fahrenheit = | 9/5C + 32 |
| Kelvin = | C + 273 |
| Thermal expansion happens on what? | The particle level |
| __________ ___________ increases with increasing temperature because ELECTRONS move more randomly. | Electrical Resistance |
| What is the measure of the resistance of liquids to flow? | Viscosity |
| Less viscous liquids are easier to pump, so engineers try to ______ liquids in piping distribution systems. | Warm |
| Q= | MC∆T |
| The quantity of thermal that flows from one place to another is called what? | Heat |
| When two objects TOUCH, thermal energy moves from the hotter one to the colder one. What is this called? | Conduction |
| Thermal energy carried from one location to another by a fluid. What is this Called? | Convection |
| When hotter molecules and colder molecules are moving at the same rate, what is it called? | Thermal Equilibrium |
| What is the best NATURAL conducter? | Diamond |
| Natural convection occurs under the influence of what? | Gravity |
| When you heat water the hot water rises, then cools and falls back down. What is this process called? | Convection current |
| Thermal energy that RADIATES from the source outward. What is this called? | Radiation |
| Thermal energy moves most efficiently through a VACUUM as __________ energy. | Radiant |
| A __________ is large amounts of EMPTY space. | Vacuum |
| The Higher the TEMPERATURE of the substance, the MORE _____________ energy is emitted. | Electomagnetic |
| Radiant energy can transfer between two objects that (are or not) in contact. | Not |
| Materials thatresist the flow of thermal energy are called what? | Insulators |
| The best insulator is a _________. | Vacuum |
| The relationship between the amount of thermal energy absorbed and the temperature chang caused by this. What is it? | Heat Capacity |
| Heat capacity is found in ______ degree Celcius. | Joules |
| C= | Q/ΔT |
| What is the amount of thermal energy exchanged per gram of material during Melating or Freezing? | Latent heat of fusion |
| What is the amount of heat it takes to change a liquid to a gas? | Latent heat of Vaporization |
| __________ is the phase change as a substance changes from a liquid to a solid. | Freezing |
| ___________is the phase change as a substance changes from a solid to a liquid. | Melting |
| ___________is the phase change as a substance changes from a gas to a liquid. | Condensation |
| ___________is the phase change as a substance changes from a liquid to a gas. | Vaporization |
| ___________is the phase change as a substance changes from a solid to a gas without passing through the intermediate state of a liquid. | Sublimation |
| ___________is the phase change as a substance changes from a gas to a solid without passing through the intermediate state of a liquid. | Deposition |
| _______________ The particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with one another. | Triple point |
| _______________ The point at which a substance in one phase, as the liquid, has the same density, pressure, and temperature as in another phase, as the gaseous. | Critical point |
| _______________ The temperature at which a liquid freezes: The freezing point of water is 32°F, 0°C. | Freezing point |
| _______________ The temperature at which the vapor pressure of a liquid is equal to the pressure of the atmosphere on the liquid, equal to 212°F (100°C) for water at sea level. | Boiling Point |
Created by:
robbiegrady414
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