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In an exceptionally stiff material such as diamond, sound travels at 12,000 metres per second (39,000 ft/s),— about 35 times its speed in air and about the fastest it can travel under normal conditions.

When you strike steel the sound energy travels further since the molecules do not have to travel as far (as in wood) to pass the sound onto the next molecle. When you strike wood some of the sound (energy) is lost as each molecule has to travel to strike the next.

Sound waves need to travel through a medium such as solids, liquids and gases. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly. Liquids are not packed as tightly.

Sound can move through the air, water, or solids, as long as there are particles to bounce off of. However, if there are not particles to bounce off of, it can’t move. There is no sound in the vacuum of space, because there is nothing to vibrate the sound.

Noises are louder at night because the noise can be heard more clearly at night without other interferring noises . Plus, there is a phenomenon called refraction that affects the direction of sound propagation. During the day, the sound bends away from the ground , during the night , it bends towards the ground.

: a dog fancier : one that is favorably disposed toward dogs.

a lover of the sea

Noun. melophile (plural melophiles) One who loves music.

Medical Definition of melomaniac 1 : an individual exhibiting melomania. 2 : an individual (as a person or dog) that is inordinately and abnormally affected by musical or other tones in certain ranges of sound.

Winter is good for the world around us. Many plants need shorter days and low temperatures to become dormant. This way plants can store up energy for new growth. But maybe the most important reason we need winter is because of the way the Earth is tilted.

Winter is often defined by meteorologists to be the three calendar months with the lowest average temperatures. This corresponds to the months of December, January and February in the Northern Hemisphere, and June, July and August in the Southern Hemisphere.

Without tilt, there would be no summer season and no winter season. The equator would always be hot and the poles would always be cold. If you start at the equator and move north, the further north you go the colder it would get.