Medium Density fiber board is 48 lb. board. High Density Fiberboard is 55 lb. board. Low Density Fiberboard is 38 lb. board. Ultra Light Fiberboard is 33 lb. board.
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The density of medium density fiberboard typically ranges from 600 kg/m3 to 800 kg/m3, depending on the manufacturer and specific product.
compression
Oil has a medium density because it is a mixture of various hydrocarbons with different molecular weights. This mixture gives oil an average density between light and heavy hydrocarbons, making it fall in the medium density range.
Refraction is the bending of waves as they pass from one medium to another of different density. This occurs because the speed of the wave changes depending on the density of the medium it is passing through.
The speed of any mechanical wave depends on the medium through which it is traveling and the properties of that medium such as density and elasticity. In general, waves travel faster through medium with higher elasticity and lower density.
The liquid state of matter typically has medium density compared to solid and gas states. In liquids, particles are closer together compared to gases but not as tightly packed as in solids, resulting in medium density.