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2. 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.

3. Mattress - Wikipedia

   en.wikipedia.org/wiki/Mattress

   Two-sided, innerspring pillow-top mattress on box-spring foundation with a woven damask cover also called a mattress sheet. A mattress is a large, usually rectangular pad for supporting a person lying down, especially for sleeping. It is designed to be used as a bed, or on a bed frame as part of a bed.

4. Memory foam - Wikipedia

   en.wikipedia.org/wiki/Memory_foam

   A memory foam mattress is usually denser than other foam mattresses, making it both more supportive and heavier. Memory foam mattresses are often sold for higher prices than traditional mattresses. Memory foam used in mattresses is commonly manufactured in densities ranging from less than 24kg/m 3 (1.5 lb/ft 3) to 128kg/m 3 (8 lb/ft 3) density

5. Vacuum mattress - Wikipedia

   en.wikipedia.org/wiki/Vacuum_mattress

   moulding of the vacuum mattress. There are three ways to put the casualty on the vacuum mattress: lifting the casualty and pushing the stretcher under it. This method requires a minimum of five team members (four lifting and one pushing the stretcher) and should be used when a spine or a pelvis trauma are suspected;

6. Mattress coil - Wikipedia

   en.wikipedia.org/wiki/Mattress_coil

   Mattress coils, also known as mattress springs, are coil springs used in a mattress. Coils are primarily used in the core (support layer) of innerspring mattresses , which is their original use. In recent years, small "micro-coils" are being used in the upholstery (comfort layer) of mattresses, primarily with a coil core ("coil-on-coil ...

7. Reduced properties - Wikipedia

   en.wikipedia.org/wiki/Reduced_properties

   These dimensionless thermodynamic coordinates, taken together with a substance's compressibility factor, provide the basis for the simplest form of the theorem of corresponding states. [1] Reduced properties are also used to define the Peng–Robinson equation of state, a model designed to provide reasonable accuracy near the critical point. [2]