product.uom tree uom_tree product.uom form uom_form Units of Measure product.uom product.uom.category tree uom_category_tree product.uom.category form uom_category_form Categories product.uom.category product.uom product.uom product.uom.category product.uom.category Units Unit u Weight Kilogram kg Gram g Carat c Pound lb Ounce oz Time Second s Minute min Hour h Day d Length Meter m Kilometer km Centimeter cm Millimeter mm Foot ft Yard yd Inch in Mile mi Volume Cubic meter m³ Liter l Cubic centimeter cm³ Cubic inch in³ Cubic foot ft³ Gallon gal Surface Square meter m² Square centimeter cm² Are a Hectare ha Square inch in² Square foot ft² Square yard yd² Energy Joule J Megajoule MJ Kilowatt-hour kW⋅h Megawatt-hour MW⋅h