If the specific gravity has a value of greater than one, then the object sinks in water and if it is less than one, then the object floats in water. If the specific gravity has a value equal to one, then the object will neither sink nor float. The specific gravity is a very important factor in different industries.
On average, your mattress should last anywhere between 8 to 10 years. However, there are a lot of elements that can increase or decrease the longevity of your mattress. Your mattress is an investment â the better you take care of it and the more money you put into it will increase the longevity of your mattress.
Life Expectancy of a Memory Foam Mattress. A memory foam mattress typically lasts longer than an innerspring mattress with the lifespan of about 10 years or more. The superior longevity can be attributed to the material that goes into its making. There are also other factors in play that determine how long a memory foam mattress will last. Density