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  2. Absorption (acoustics) - Wikipedia

    en.wikipedia.org/wiki/Absorption_(acoustics)

    In acoustics, absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body. The energy transformed into heat is said to have been 'lost ...

  3. Acoustic foam - Wikipedia

    en.wikipedia.org/wiki/Acoustic_foam

    A close-up image of acoustic foam. Acoustic foam is an open celled foam used for acoustic treatment. It attenuates airborne sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1] The energy is dissipated as heat. [2] Acoustic foam can be made in several different colors, sizes and thickness. [3]

  4. Foam glass - Wikipedia

    en.wikipedia.org/wiki/Foam_glass

    Foam glass does not absorb water. The cells are mostly closed, so there is no capillary rise. Foam glass has an operating temperature range of -200 to 450 °C and a small expansion coefficient (8 × 10 °C). Foam glass with open pores absorbs sound and is used as a sound insulation material. Penetration loss can be around 28.3 dB in 60~400 Hz.

  5. Melamine foam - Wikipedia

    en.wikipedia.org/wiki/Melamine_foam

    On a larger scale, the material feels soft because the reticulated foam bubbles interconnect. Its structure is a 3D network of very hard strands, when compared to the array of separate bubbles in a material such as styrofoam. [1] Being microporous, it also effectively absorbs sound waves.

  6. Thermal insulation - Wikipedia

    en.wikipedia.org/wiki/Thermal_insulation

    Heat flow is an inevitable consequence of contact between objects of different temperature. Thermal insulation provides a region of insulation in which thermal conduction is reduced, creating a thermal break or thermal barrier, [1] or thermal radiation is reflected rather than absorbed by the lower-temperature body.

  7. Polyurethane foam - Wikipedia

    en.wikipedia.org/wiki/Polyurethane_foam

    An assortment of polyurethane foam products for cushioning and insulation. Polyurethane foam is a solid polymeric foam based on polyurethane chemistry. As a specialist synthetic material with highly diverse applications, polyurethane foams are primarily used for thermal insulation and as a cushioning material in mattresses, upholstered furniture or as seating in vehicles.