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.
When to Buy a Mattress. Finding a mattress that suits your particular preferences is vital for getting a good nightâs sleep. How often you should replace your mattress depends on many different things, such as the original quality, but you should typically replace your mattress every seven years or so. Another clue is to look at the warrantyâonce itâs up, it might be time for a newer model.