I learnt What is Sound and What are Sound Waves.
Sound is a type of energy. It is a vibration that travels through the surroundings and enters our ears as sound .
Sound waves are waves which radiate out from their source in circles. The particles of air in the wave move backward and forwards in the same direction as the sound is travelling. These bands of compression and rarefaction move along the spring. This is how s sound wave moves through air, water or solid materials.
Sounds needs to travel through a medium, such as a gas, a liquid or a solid. It cannot travel through a vacuum. This is because sound is a form of energy. In order for sound to move it has to tranfer its energy from one particle to another. If there are no particles, sound cannot travel.
Sound waves are invisible to us, but they can be represented by a machine called an Oscilloscope.
(source taken from book: physical sound IN DEPTH, SOUND)
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