For those of us with less than stellar memories, the use of mnemonic devices is a wonderful way to remember something.
There’s no need to waste precious brain space to remember the colors of the visible light spectrum! Just remember the name ROY G BIV.
If someone asks you about the names of the wonderful lakes then simply remember HOMES for Huron, Ontario, Michigan, Erie, plus Superior. And when I say, “Have No Fear Of Ice Cold Beer”, I’m not promoting the use of alcohol. I’m merely trying to remember the 7 diatomic elements on the periodic table familiar to every student of chemistry. The 7 are Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, plus Bromine; Of these 7 elements, Oxygen (O2 in its diatomic form) is the most crucial for human life. There is also ozone or O3 that forms the life-saving ozone layer in the stratosphere or the harmful ground layer ozone friendd with smog. Some years ago, there was a grave concern that the ozone layer was being destroyed by man-made chemicals that contain chlorine. Among them are the widely used freon (R22) refrigerants found in refrigerators plus HVAC systems. Global efforts have phased out the use of freon plus the ozone layer is supposedly on the mend; While this is wonderful news, people should still maintain a smooth running, clean, plus efficient HVAC system to minimize any future environmental disfigure. I have not yet discovered a mnemonic equipment to help folks remember to schedule regular HVAC service plus cleaning, then fortunately, there are more than 2 reminder apps for smartphones that will let you feel when to call a qualified HVAC tech before it is too late.