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Metric (SI) Units:

Milligram (mg): Essential for medicine dosages and chemical analysis.

Gram (g): Basic unit for small items like spices or jewelry.

Kilogram (kg): The global standard for body weight and groceries (1kg = 1000g).

Metric Ton (t): Used for heavy industrial loads (1000kg).

Imperial & US Units:

Ounce (oz): Used for mail, food portions, and precious metals.

Pound (lb): Primary unit for body weight in the US/UK (1lb = 16oz).

Stone (st): Still commonly used in the UK/Ireland for body weight (1st = 14lbs).

Short Ton (US): Standard for commercial weight in the US (2000 lbs).

Metric (SI) Units:

Millimeter (mm): Precision unit for small parts, engineering, and rain depth.

Centimeter (cm): Daily measure for height, clothing, and household objects (1cm = 10mm).

Meter (m): The global standard for room dimensions and sports (1m = 100cm).

Kilometer (km): Standard for travel distance and geographical maps (1km = 1000m).

Imperial Units:

Inch (in): Primary unit for screen sizes, tools, and construction (1in = 2.54cm).

Foot (ft): Used for human height and architectural heights (1ft = 12in).

Yard (yd): Common in textiles and American football fields (1yd = 3ft).

Mile (mi): The standard for road distances in the US/UK (1mi = 1.609km).

Metric Units:

Millilitre (ml): Used for medicine, perfumes, and small drinks.

Litre (L): Standard unit for beverages and fuel (1L = 1000ml).

Imperial Units:

Fluid Ounce (fl oz): Common for bottled drinks and cosmetics.

Gallon (gal): Used for fuel (US) and large water containers.

Standard Scales:

Celsius (°C): The global standard for weather, cooking, and science. Water freezes at 0°C and boils at 100°C.

Fahrenheit (°F): Used primarily in the USA for weather and ovens. Water freezes at 32°F and boils at 212°F.

Kelvin (K): The scientific base unit for thermodynamic temperature (0K is absolute zero).