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.
How long does a memory foam queen mattress last? Depending on the brand, memory foam mattresses typically last anywhere from 5-15 years before it is suggested they be replaced. If the memory form is starting to feel flat or â¦ hard, it may be time to replace.