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.
Best Mattresses for Kids. The Developmental Years. While children seem to quickly outgrow shoes, clothes, and other items, they don't necessarily need to outgrow their mattresses. In fact, children often sleep on the same bed and mattress for several years, sometimes for the entirety of their formative years and into their teen years. That means with some forethought you can invest in a high-quality mattress that will last for around 10 years and accommodate them for the majority of their childhood.