Keeping clean
When reading the printed matter on the wrapper of a bar of toilet soap, you see the following: TFM = 75% written in bold letters.
What is the meaning of TFM and what is its significance?
The chief ingredients of soap are fats manufacturers either use animal fats or a vegetable oil, like coconut oil-and an alkali, usually caustic soda. The fats are the most important part of the soap.
TFM stands for Total Fatty Matter. This expresses the real soap content in the toilet soap. If TFM is given as 75% it means that the actual soap content is 75%, while the remaining portion consists of additives, which make it foam, give it its colour, or keep it hard.
The higher the TFM percentage, the better is the quality of the soap. It is binding on the manufacturer to state how much fatty material there is in the soap.
Crystals under pressure
What is piezoelectricity? How is it produced?
Electricity resulting from the application of mechanical pressure on certain crystals like quartz and tourmaline is called piezoelectricity. When these crystals are subjected to mechanical strain, a voltage is produced across their opposite faces. Conversely when a voltage is applied to such crystals, they vibrate.
Piezoelectric materials are used for converting mechanical strain into an electrical signal in such devices as microphones and phonograph pickups. The converse effect in which a mechanical output is derived from an electrical signal output is used in such devices as headphones and quartz watches.
The phenomenon of piezoelectricity was discovered in the 1880s.
Picture Credit : Google
