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Home & Living 6 min How hard design rain falls on a roof gutter in Singapore and Malaysia The water a roof gutter must carry is the design rainfall intensity multiplied by the roof's catchment area, a... AM Amelia Wong 19 Oct Home & Living 6 min Cake tin size charts hold up on area swaps and vary on cups Scaling a recipe to another cake tin by base area keeps the batter as deep as the recipe intended, while the t... AM Amelia Wong 15 Oct Home & Living 6 min Dog pregnancy length and why counting from mating widens the due date A dog's pregnancy averages about 63 days counted from ovulation, but how wide the window is depends on which e... AM Amelia Wong 15 Oct Home & Living 6 min Singapore, Malaysia and Hong Kong codes set stair risers lower than a US layout assumes Singapore's Fire Code and Hong Kong's Fire Safety Code limit risers in their escape stairs to 175 mm, and Mala... AM Amelia Wong 14 Oct Home & Living 6 min A cat's age in human years is read off a chart printed with no stated basis The usual cat-years chart gives 15 human years for a cat's first year, 24 by its second birthday and 4 for eac... AM Amelia Wong 12 Oct Home & Living 5 min How hot, how much and how long to brew each Chinese tea Green tea near 80 °C, oolong near 95 °C, ripe pu-erh at a boil, and black tea anywhere between. We compared 11... AM Amelia Wong 23 Sep Home & Living 7 min Singapore's humidity swings thirty points a day without the water changing Relative humidity is a ratio whose denominator moves with temperature, so 70% at 31°C holds two and a half tim... EV Eva Chin 20 Sep Home & Living 7 min Singapore's Safety Mark covers 33 kinds of product, and power banks are not one The SAFETY Mark is required only on 33 categories of Controlled Goods. Power banks are not among them and are... AM Amelia Wong 17 Sep Home & Living 6 min Your air conditioner's seasonal rating is mostly extrapolation The CSPF on labels across Southeast Asia is computed against a reference season defined in ISO 16358-1, where... AM Amelia Wong 12 Sep Science 6 min A TDS meter cannot measure total dissolved solids Total dissolved solids is defined as a weight — filter, evaporate, weigh the residue at 180 °C. A handheld pen... NA Nadia Rahim 11 Sep Home & Living 6 min Four different electricity prices are printed on appliance labels in one shop US regulations fix a refrigerator's running cost at 14 cents a kilowatt-hour, an air conditioner's at 13, a ce... AM Amelia Wong 9 Sep Home & Living 5 min New air conditioners clear a global-warming limit on 2013 figures Singapore bars household air conditioners whose refrigerant exceeds a global warming potential of 750. The reg... AM Amelia Wong 4 Sep Science 7 min Your CO2 monitor's red line is a 19th-century number, and it is drifting The 1000 ppm line is Pettenkofer's, proposed in the 19th century as a proxy for whether a room smelled stuffy.... NA Nadia Rahim 4 Sep Home & Living 7 min One Checkbox Multiplies Your Ink Bill by Thirteen Cartridge yields are rated against test pages averaging about 5 per cent ink coverage. We printed five of our... AM Amelia Wong 11 Aug Home & Living 15 min House Calculations for a Tropical Climate Ask this site how much air-conditioning a Petaling Jaya bedroom needs and, until this week, you got two differ... AM Amelia Wong 29 Jul