Dissolved in water the salts deposited on the walls of the vessels for boiling in a permanent scale, which is difficult even mechanical cleaning. However, the scale is well softened and then deleted if the capacity to put potato peelings: after boiling the precipitated salt is easily scraped off with a wooden spatula.
Recommend to read
THERMOSTAT
This device is not very complicated and consists of the heating element, the mercury column and the solenoid. When the current is switched on starts to operate the heater — closed...
MODEL AIRCRAFT ALL-AROUND
All-around radio controlled model gliders (class F-3-B), which includes three flight exercises, is the youngest species of the competitions of flying models. It is flying on the...