Lewis structure of water The Lewis structures, also called Lewis-dot diagrams or electron dot diagrams are pictures that show the bonding between a pair of electrons and the atoms of a molecule. Each dot represents one electron. Two dots side by side represent a lone pair of electrons. To show a bond between atoms, a line representing a pair of shared electrons is placed between the two atoms.
Or, maybe you're wondering just how old the tires are on the motorcycle you just bought. Here's how to tell: Look on the sidewall of the tire for the DOT symbol. Follow the line of text and numbers after the DOT symbol until you reach the end. If the tire was manufactured in the year 2000 or later, the last 4 digits give the age. The last 2 digits give the year and the preceding 2 digits give the week of manufacture.
How to Measure a Bicycle Tire. Bicycle tire measurements have two components. The larger number is the tire diameter in inches, and the smaller number is the tire width in inches. Tire diameter usually ranges from 12 to 26 inches, and tire width normally ranges from 1.75 to 2.215 inches.