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S3 Physics: Heat - Marcador
S3 Physics: Heat - Detalles
Niveles:
Preguntas:
70 preguntas
| 🇬🇧 | 🇬🇧 |
| What is Temperature? | A measure of how hot or cold a substance is |
| What are the units of temperature? | °C, °F, K |
| What are the two types of thermometers? | Clinical and laboratory |
| What physical change takes place in a thermometer in order to measure temperature? | Liquid expands and rises up the tube when heated. When cooled the liquid contracts and falls down the tube. |
| What is the main shape of a clinical thermometer thread and why? | Kinked shape. Prevents reading from dropping immediately |
| What do you need to do before using a clinical thermometer? | Reset it. Shake the thermometer. |
| What is Heat? | Heat is a type of energy. |
| State how heat travels. (From ___ temp ⇾ ___ temp) | High-temperature ⇾ Low temperature |
| What is specific heat capacity? | The amount of heat energy needed to change the temperature of 1kg of a substance by 1°C |
| In the following equation, what does c represent?: Eh= cmΔT | Specific Heat Capacity |
| In the following equation, what does ΔT represent?:Eh = cmΔT | Change in temperature in °C |
| In the following equation, what happens when the mass or Specific Heat Capacity is increased or decreased?: Eh = cmΔT | Energy supplied (Eh), increases accordingly. |
| What are the 3 methods of heat transfer? | Conduction, Convection, Radiation |
| What is conduction? | Heat transfer when things are in contact. |
| What is a heat conductor? | Material that allows heat to move easily through. |
| What materials are poor heat conductors? | Non-Metals |
| What states of matter are poor conductors of heat? | Liquids and gases. |
| Describe the process of heat conduction. | As heat energy is added, particles vibrate. Vibrations are passed on from particle to particle. This transfers heat throughout the object. |
| What can we call bad conductors of heat? | Good thermal insulators. |
| What are thermal insulators used for? | To slow down the conduction of thermal energy. |
| How do thermal insulators work? | By trapping pockets of air to slow conduction. |
| What is convection? | Heat transfer taking place in liquids and gases. |
| What is density? | The mass in a particular volume. |
| Can the particles in liquids and gases move freely? Why? | Yes. Not dense, space between particles. |
| Describe a convection current. | Less dense substance particles rise (Hot). More dense substance particles fall. (Cold) |
| Why doesn’t convection occur in solids? | They are too dense. Particles can’t move. |
| What happens to the particles in air when they are heated? | They Get further apart. |
| Why do birds puff up their feathers in winter? | To trap air between their feathers, as it is a good thermal insulator. Helps them stay warm. |
| Name 3 real-life uses of convection. | Hot air balloon, radiator, kettle |
| What is infrared radiation? | A type of electromagnetic radiation. |
| How do we feel infrared radiation? | We feel it as heat. |
| What type of heat transfer can occur through a vacuum? | Radiation only. |
| What type of surfaces are good at absorbing and emitting radiation? | Dark and Dull surfaces. |
| What type of surfaces are good at reflecting radiation? | Shiny and silver surfaces. |
| If boiling water was put in both a black flask and a silver flask, in which flask would the water cool down quickest and why? | Black flask quickest. Dark surface absorbs infrared radiation and emits it, more heat is lost. |
| How can you prevent heat loss in the roof of a house? | Roof insulation. Install thermal insulator between ceiling joists. |
| How can heat be lost through the walls of a house? | Convection + Conduction |
| How can you prevent heat loss through the walls of a house? | Wall insulation. Thermal insulator between wall cavities. |
| How can you prevent heat loss through the windows of a house? | Double glazing. Two glass panes with air between. |
| What happens to a substance’s temperature as it changes state? | It stays constant. |
| What happens to energy supplied or released when a substance is changing state. | It goes into either separating the particles or bringing them closer together. |
| What is specific latent heat? | The energy required to change 1kg of a substance from solid⇾liquid at melting point, or liquid⇾gas at boiling point. |
| What is the specific latent heat of fusion? | The energy required to change 1kg of a substance from a solid to liquid at the melting point. |
| What is the specific latent heat of vaporisation? | The energy required to change 1kg of a substance from liquid to gas at the boiling point. |
| In the equation “Eh=ml” what does l stand for? | Specific latent heat. |