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 Heat Transfer 40 Flashcards |
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What is the unit of measurement for heat energy? |
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Joules (J) |
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True or False: Heat flows from a colder object to a hotter object when in contact. |
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False. Heat flows from a hotter object to a colder object when in contact. |
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Fill in the blank: The total kinetic energy of all the molecules in a substance is called its ______. |
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Internal kinetic energy |
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What is the process called when a solid changes directly into a gas? |
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Sublimation |
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Riddle: I change from liquid to gas at any temperature, but I boil at a fixed point. What am I? |
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Water (or any liquid) |
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Which of the following processes occurs at a fixed temperature? A) Evaporation B) Condensation C) Boiling D) Sublimation |
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C) Boiling |
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Fill in the blank: When a body loses heat, its temperature ______. |
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Decreases |
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Short Answer: What phenomenon explains the increase in size of a material when heated? |
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Thermal expansion |
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True or False: Evaporation occurs only at the surface of a liquid. |
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True. |
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What happens to the average kinetic energy of molecules when a liquid is heated? |
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It increases. |
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Fill in the blank: The increase in length of a solid when heated is referred to as ______. |
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Linear expansion |
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Riddle: I am the temperature at which a liquid boils, but I can change based on pressure. What am I? |
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Boiling point |
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Which of the following materials expands the least when heated? A) Copper B) Iron C) Invar D) Aluminum |
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C) Invar |
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Fill in the blank: The coefficient of linear expansion is represented by the symbol ______. |
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Α (alpha) |
Card: 28 / 40 |
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True or False: Gases have a fixed shape and volume when heated. |
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False. Gases do not have a fixed shape or volume. |
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What is the term for the heat absorbed or released during a change of state in a substance? |
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Latent heat |
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Short Answer: What is the anomaly in the behavior of water between 0°C and 4°C? |
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Water contracts when heated from 0°C to 4°C. |
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Fill in the blank: The increase in area of a solid when heated is called ______. |
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Superficial expansion |
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Which of the following statements is true regarding thermal expansion? A) All materials expand equally B) Solids expand more than liquids C) Liquids expand more than solids D) Gases contract when heated |
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C) Liquids expand more than solids |
Card: 38 / 40 |
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What is the term used to describe the internal energy of a substance, measured in joules (symbol: J)? |
Card: 39 / 40 |
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Heat |
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