Passive systems rely on heat-driven convection or heat pipes to circulate water or heating fluid in the system. Passive solar water heating systems cost less and have extremely low or no maintenance, but the efficiency of a passive system is significantly lower than that of an active system.
316L Stainless Steel. 316L Stainless Steel is commonly used for jewelry because with it will not oxidize nor turn black with only minimal maintenance. Its resistance to corrosion and staining, as well as its durability and sleek look have made stainless steel body jewelry the most popular type of material for piercing enthusiasts worldwide. Our body jewelry products are made with high quality 316L Surgical Steel which is safe for all types of body piercings or implants.
cpovey. Steel is an alloy of iron and carbon. Stainless steel adds Chrome and Nickel, and possibly other elements, like Vanadium and Manganese, depending upon the properties desired. Most stainless is not magnetic, but obviously stainless steel knives are magnetic, otherwise they would not stick to the magnetic holders.Wikipedia has an explanation, but it's kind of complex. Basically, it depends upon how the steel is cooled and how the crystals form determines if the steel is magnetic or not.povey. Steel is an alloy of iron and carbon. Stainless steel adds Chrome and Nickel, and possibly other elements, like Vanadium and Manganese, depending upon the properties desired. Most stainless is not magnetic, but obviously stainless steel knives are magnetic, otherwise they would not stick to the magnetic holders.