If you have ever come across a memory foam mattress, or read any of the Nectar bed reviews, you will have noticed two terms that people seem to use again and again, being “density” and “firmness”. Density is often used to determine whether a mattress is of high quality – the denser, the better. However, more density usually also means more money, although you do get increased durability in return. Density is measured in pcf (Pounds per Cubic Foot), although most people will simply say “pounds”. Mattresses are available of between 2.5pcf and 9pcf, although it is said that there…