Across
- 2. a change directly from the solid to the gaseous state without becoming liquid
- 5. a very small piece of matter, such as an electron or proton , that is part of an atom
- 9. it changes from a liquid state to a gas, because its temperature has increased.
- 10. a liquid; a substance that can flow
- 11. a very small piece of matter (= a substance) that carries no electric charge and that forms part of the nucleus
- 13. a device that has electrical resistance and that is used in an electric circuit for protection, operation, or current control
- 16. the force produced by the quantity of gas or liquid in that place or container；The amount of force exerted on a surface
- 18. of definite shape and volume; not liquid or gaseous.
- 21. a very small piece of matter (= a substance) with a negative electric charge, found in all atoms
- 22. rain, snow, etc. that falls; a chemical process in which solid material is separated from a liquid
- 23. any substance that is neither liquid nor solid, for example oxygen or hydrogen.
- 24. the height to which something is elevated
- 25. the process of a gas changing to a liquid;drops of water that form on a cold surface when warm water vapour becomes cool
- 27. force the upward force exerted by any fluid upon a body placed in it
- 29. an arrangement of the parts of or elements in an electric circuit whereby the whole current passes through each part or eleme
Down
- 1. a substance that flows freely and is not a solid or a gas, for example water or oil
- 3. a meter that measures the flow of electrical current in amperes
- 4. an instrument for measuring in volts the differences in potential between different points of an electrical circuit
- 6. principle the upward buoyant force that is exerted on a body immersed in a fluid, is equal to the weight of fluid displaced by it
- 7. a movement of positive or negative electric particles (such as electrons)
- 8. a unit of force
- 12. an assemblage of electronic elements;the complete path of an electric current including usually the source of electric energy
- 14. an arrangement of electrical devices in a circuit in which each resistance being on a different branch of the circuit
- 15. A switch is a small control for an electrical device which you use to turn the device on or off.
- 17. electric potential or potential difference expressed in volts
- 19. the thickness of a solid, liquid or gas measured by its mass per unit of volume
- 20. a very small piece of matter (= a substance) with a positive electric charge that forms part of the nucleus (= central part)
- 22. a unit of pressure in the meter-kilogram-second system equivalent to one newton per square meter
- 26. the part of an atom that contains most of its mass and that carries a positive electric charge
- 28. law a law in electricity: the strength of current is directly proportional to the voltage and inversely to the resistance