Practical guides that help you compare options and choose the right product.
One adult hand is 450 millilitres of volume and 400 square centimetres of skin. A 2-litre bucket needs 1,550 ml of alginate,…
One head is 5.28 square metres of hair. Thirty millilitres spread over that is a 5.7 micrometre film, and half of it…
A 2 cm gap is a tolerance, not a dimension. A 7.8 mm phone falls through a 20 mm slot in 0.175…
A 34.5 by 15.5 by 35.5 cm shelf rated to 20 kg. An A4 folder overhangs it by 5.5 cm, a laptop…
A $65.99 caddy with 28.8 cm2 of open base. The sponge carries 200 g of water, a closed basin saturates in two…
A $79.99 magnetic ring that never states a field strength. The distance table, the two pascals of force, the 0.11 milliamp cell…
750 ml is five pours, 5.5 standard drinks and up to 112 milligrams of oxygen waiting in the headspace. The arithmetic behind…
An eight-minute shower passes 76 litres; one percent of it leaves the tray on you, and 760 mL over a square metre…
SPF 50+ describes a film of 2 mg per square centimetre, not a bottle. On a 600 cm2 face that is 1.2…
An electric fence rarely breaks; it drains. The charge leaves the wire across a film of water on the post, and how…
A 30.5 cm box in a 31 cm drawer still jams, because the number people measure is the only one that was…
A 50 m watch is immersed in 10 cm of water, held at 5 bar for ten minutes, and tested as a…
A hundred and twenty bars pass through one doorway in three hours, and the bowl on the step sits 19 cm off…
One adult sheds about 27,375 hairs a year – 5,475 metres end to end, and only 35 grams. That is the scaffold,…
A 5 kg cat costs about 281 kcal a day, its treats are capped at 28, and a 74 g meal disappears…
A 1 mm bite means ten passes for every centimetre you take off, and about 1,200 closings in a twenty-minute session. What…
A $53.99 bamboo drawer box and a $67.99 desk shelf sit in the same aisle and measure out at $35.00 and $5.23…
A cork rarely breaks because the wine is old. It breaks on six decisions taken before the screw turns: a dry stopper…
Every price in this catalogue ends in .99 – 76 items out of 76. The endings are worth 76 cents in total,…
A kilogram of aluminium carries about 13.5 kWh of electricity and sits behind four to five tonnes of bauxite. In a $63.99…
A 100 ml eau de parfum carries about 15 ml of fragrance oil and roughly 1,000 pumps. A body mist at the…
A $29.99 ring costs 9.6 cents every time you wear it; a $102.99 cleaver costs 4 cents a cut. The division is…
A crystal set is sold on colour. Hardness, cleavage and density decide whether it still looks the same in three years, and…
Hardness, edge angle and board abrasion decide how a knife cuts and how often it needs a stone. The 58 HRC label…
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