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.
To determine the ISO diameter, measure in millimeters from the center of the wheel to only the inner edge of the tire and double the figure. Step 3. Measure the flat surface across the tire's tread from one side of the tire to the other. This is the tire width. Measure in inches for traditional tire measurements or in millimeters for the ISO measurement. Combine the measurements of tire diameter and width to obtain the tire size. Traditional bike tire sizes place the diameter first and the width second. ISO sizes place the width first and the diameter second. Standard tire sizes are in full-inch increments for the diameter. If you are slightly over or under, round to the nearest inch.