Heat is a form of energy that is transferred from a hotter object to a colder object., Note, Ok ethan, A hotter object has a higher temperature than a colder object., Note, Ok ethan, A thermometer is used to measure temperature., Note, Ok ethan, The transfer of heat between two objects can cause the temperature of the objects to change until both objects reach the same temperature., Note, Ok ethan, The hotter object will lose heat and decrease temperature. Example: a cup of hot tea; the heat is transferred from the hot tea to the surrounding air. After some time, the tea has the same temperature as the surrounding air., Note, Ok ethan, An object can change in state when it gains or loses heat. Example: When water is heated, it gains heat and changes into a gas called water vapour. When water vapour is cooled, it loses heat and changes back into a liquid., Note, Ok ethan, Conduction is the transfer of heat between objects that are in contact with each other., Note, Ok ethan, Good conductors of heat are materials which allow heat to be transferred through them easily. For example, metal., Note, Ok ethan, Good conductors of heat are suitable for making cooking utensils, so food can get heated up quickly., Note, Ok ethan, Poor conductors of heat are materials which do not allow heat to be transferred through them easily. For example, wood, plastic, and rubber., Note, Ok ethan, Poor conductors are good for making the handle of a metal pot, so our hands are protected from the hot metal pot., Note, Ok ethan, Convection is the transfer of heat by the movement of liquids and gases., Note, Ok ethan, Heat transfer by convection is used in many appliances at home, like in an electric kettle to boil water and in a steamer to cook food too., Note, Ok ethan, Radiation is the transfer of heat directly from one object to another with or without any material in between them., Note, Ok ethan, Radiation means that heat can be transferred through air or a vacuum (space without any matter), Note, Ok ethan, Materials that catch fire easily are called flammable materials. They can be solid, liquid or gas., Note, Ok ethan, Examples of flammable solids are paper, wood, and cloth., Note, Ok ethan, Examples of flammable liquids are alcohol, petrol, and cooking oil., Note, Ok ethan, Examples of flammable gases are alcohol vapour, petrol vapour, and cooking gas., Note, Ok ethan, Correct ways to handle flammable materials:, Store flammable material such as cooking oil in a cool place., Do not place flammable materials near an open fire., Keep a fire blanket or a fire extinguisher in a place that can be reached easily, so fire can be put out easily., What is heat?, A. A type of matter, B. A form of light, C. A form of energy transferred from a hotter object to a colder object, D. A type of force, Heat always moves from a ___ object to a ___ object., A. cold, hot, B. hot, cold, C. small, big, D. big, small, A hotter object has a ___ temperature than a colder object., A. lower, B. higher, C. equal, D. zero, Which tool is used to measure temperature?, A. Barometer, B. Ruler, C. Thermometer, D. Scale, Heat transfer between two objects continues until they reach the same ___., A. size, B. shape, C. color, D. temperature, When an object loses heat, its temperature will ___., A. increase, B. decrease, C. stay the same, D. disappear, Heat from hot tea is transferred to the ___., A. cup, B. table, C. surrounding air, D. spoon, When water gains heat, it changes into ___., A. ice, B. water vapour, C. solid metal, D. smoke, When water vapour loses heat, it becomes a __, A. gas, B. solid, C. liquid, D. flame, Heat transfer by direct contact is called ___, A. Conduction, B. Convection, C. Radiation, D. Evaporation, Conduction happens when objects are in ___, A. motion, B. air, C. contact, D. darkness, Which material is a good conductor of heat?, A. Wood, B. Plastic, C. Metal, D. Rubber, Cooking utensils are usually made of good conductors so food can ___., A. stay cold, B. heat quickly, C. change color, D. become heavier, Which is a poor conductor of heat?, A. Iron, B. Copper, C. Rubber, D. Steel, Pot handles are made from poor conductors to ___., A. cook faster, B. protect our hands from heat, C. change color, D. increase weight, Heat transfer by movement of liquids and gases is called ___., A. Convection, B. Conduction, C. Radiation, D. Reflection, Convection happens mostly in ___, A. solids, B. liquids and gases, C. metals only, D. plastics only, An electric kettle uses ___ to boil water., A. radiation only, B. convection, C. freezing, D. melting, A food steamer cooks food mainly by ___., A. Conduction, B. Convection, C. Radiation, D. Evaporation, Heat transfer without contact or material is called ___., A. Conduction, B. Convection, C. Radiation, D. Evaporation, Radiation can travel through ___., A. solids only, B. liquids only, C. air or a vacuum, D. wood only, Materials that catch fire easily are called ___, A. waterproof, B. heavy, C. magnetic, D. flammable, Flammable materials can be _, A. solids only, B. liquids only, C. gases only, D. solid, liquid, or gas, Which of the following is a flammable solid?, A. Water, B. Paper, C. Glass, D. Stone, Which is a flammable liquid?, A. Milk, B. Juice, C. Petrol, D. Water, Which is a flammable gas?, A. Oxygen, B. Carbon dioxide, C. Cooking gas, D. Nitrogen, Flammable materials should be stored in a ___ place, A. hot, B. cool, C. dark, D. wet, Flammable materials should be kept away from ___., A. water, B. wind, C. open fire, D. paper, What should be kept nearby to put out a fire easily?, A. Spoon, B. Plate, C. Fire blanket or fire extinguisher, D. Book, Why is it important to handle flammable materials carefully?, A. To make them heavier, B. To change their color, C. To prevent fire accidents, D. To cool them faster, Heat is a form of energy transferred from a colder object to a hotter object., True, False, A hotter object has a higher temperature than a colder object., True, False, A thermometer is used to measure temperature., True, False, Heat transfer stops when two objects reach the same temperature., True, False, When an object loses heat, its temperature increases., True, False, Water changes into water vapour when it gains heat., True, False, Water vapour becomes liquid when it loses heat., True, False, Conduction is heat transfer through direct contact between objects., True, False, Wood and plastic are good conductors of heat., True, False, Metal is commonly used for cooking utensils because it conducts heat well., True, False, Convection is the transfer of heat in solids only., True, False, Radiation can transfer heat through air or a vacuum., True, False, Flammable materials cannot catch fire easily., True, False, Petrol and alcohol are examples of flammable liquids., True, False, Keeping a fire extinguisher nearby helps put out fires quickly., True, False, Heat is a form of energy that is transferred from a hotter object to a colder object., True, False, A colder object has a higher temperature than a higher object., True, False, A thermometer is used to measure temperature, True, False, The hotter object will lose heat and decrease temperature, True, False, When water vapour is cooled, it loses heat and changes back into a gas, True, False, poor conductors of heat are materials which allow heat to be transferred through them easily., True, False, Good conductors of heat are suitable for making cooking utensils, so food can get heated up quickly, True, False, Poor conductors of heat are materials which do not allow heat to be transferred through them easily, True, False, Convection is the transfer of heat by the movement of liquids and solids, True, False, Radiation is the transfer of heat directly from one object to another with or without any material in between them., True, False, Examples of flammable solids are petrol , wood, and cloth., True, False, Examples of flammable liquids are alcohol, petrol, and cooking oil., True, False, Examples of flammable gases are alcohol vapour, petrol vapour, and cooking gas., True, False, Store flammable material such as cooking oil in a hot place., True, False, Do not place flammable materials near an open fire., True, False, What is heat?, answer, ok ethan, What is heat?, Answer: Heat is a form of energy that is transferred from a hotter object to a colder object., ok ethan, What happens to the temperature of two objects when heat is transferred between them?, answer, ok ethan, What happens to the temperature of two objects when heat is transferred between them?, Answer: Their temperatures change until both objects reach the same temperature., ok ethan, Explain what happens when hot tea is left in a room for some time., answer, ok ethan, Explain what happens when hot tea is left in a room for some time., Answer: Heat is transferred from the hot tea to the surrounding air, so the tea cools down until it has the same temperature as the air., ok ethan, How can heat cause a change in the state of water?, answer, ok ethan, How can heat cause a change in the state of water?, Answer: When water gains heat, it changes into water vapour (gas). When water vapour loses heat, it changes back into liquid water., ok ethan, What is conduction? Give one example, answer, ok ethan, What is conduction? Give one example, Answer: Conduction is the transfer of heat between objects that are in direct contact. An example is heat moving through a metal cooking pot., ok ethan, Why are metals used to make cooking utensils?, answer, ok ethan, Why are metals used to make cooking utensils?, Answer: Metals are good conductors of heat, so they allow food to heat up quickly., ok ethan, What is convection and where does it occur?, answer, ok ethan, What is convection and where does it occur?, Answer: Convection is the transfer of heat by the movement of liquids and gases. It occurs in things like boiling water in a kettle or steam in a steamer., ok ethan, What is radiation?, answer, ok ethan, What is radiation?, Answer: Radiation is the transfer of heat directly from one object to another without needing any material in between, and it can travel through air or a vacuum., ok ethan, What are flammable materials? Give two examples., answer, ok ethan, What are flammable materials? Give two examples., Answer: Flammable materials are substances that catch fire easily. Examples include paper and petrol., ok ethan, Mention two safe ways to handle flammable materials., answer, ok ethan, Mention two safe ways to handle flammable materials., Answer: Store them in a cool place and keep them away from open fire. Keeping a fire extinguisher nearby is also important., ok ethan

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