4:3 is more common for photos, used in micro four-thirds cameras. 4:3 is ideal for close-ups and single-person portraits. 4:3 allows more vertical information for depth effect. Instagram prefers 1:1 format, making 4:3 better for photos
Ratio compares two or more numbers by division. Antecedent is the number being divided, consequent is the dividing number. Ratios can be Part-to-Part (two quantities) or Part-to-Whole (total)
PPM measures substance concentration in solutions or mixtures. Calculated by dividing substance mass/volume by total solution, then multiplying by 10^6. Can be calculated using both mass and volume measurements
National flags represent and symbolize countries. Common elements include stars, stripes, crosses, and canton. Many flags share design elements with countries with shared history
Percentage represents a proportion of a number or item. Percentages range from 0 to 100. Percentage symbol is '%'. 100% of a number equals the original number
Rates are ratios of values representing different units of measure. Unit rate is a rate expressed for the quantity of one. Rates are used in daily life and grocery shopping