Assertion: foam's density | /r/CapableOf | determine firmness
Facets:
Source sentences:
text: However, density isn't the only factor that will determine the comfort and firmness of a mattress.
text: A common misunderstanding is that the density of foam – in a mattress or pillow for example – determines its firmness.
text: The density together with the IFD/ILD and the resilience will determine the softness, firmness, and life-span of the foam.