You may not think of salt and sugar as solids because when you see them in the kitchen they are such small particles. But each of these particles is as much a solid as a wooden table, a glass window, or a gold piece of jewelry. A solid is a collection of atoms or molecules that are held together so that, under constant conditions, they maintain a defined shape and size.
Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off.
Electronics Printed circuit board PCB is used to mechanically support and electrically connect electronic components using conductive pathways, tracks ethched from copper shee â¦ ts laminated onto a non-conductive substrate.It is also known as printed wiring board (PWB) or etched wiring board Chemistry and Environmental PCB can stand for Poly-Chlorinated Biphenyls, which were used industrially as coolant fluids and plasticizers until they were identified as biologically toxic in the ...