Author: eduKate Asia
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PSLE Science Reality Lab Vol No.184 | “Total Ozone = 300 DU” — Is the Ozone Layer 300 mm Thick?
A Primary 5/6 PSLE Science Reality Lab guide to Dobson Units: learn why 300 DU describes total-column ozone and does not mean a 300 mm-thick physical ozone layer.
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PSLE Science Reality Lab Vol No.183 | “Salinity = 35 PSU” — Is 35% of the Seawater Salt?
A Primary 5/6 PSLE Science Reality Lab guide to practical salinity: learn why a reading near 35 PSU is not 35% salt, and how conductivity-based salinity values should be interpreted.
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PSLE Science Reality Lab Vol No.182 | “LED Colour Temperature = 3000 K” — Is the Bulb Really 3000 K Hot?
A Primary 5/6 PSLE Science Reality Lab guide to LED colour-temperature labels: learn why 3000 K describes a light’s colour appearance, not the physical operating temperature of the bulb.
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PSLE Science Reality Lab Vol No.181 | “Sound Level = 60 dB” — Is That Only Twice the Sound Intensity of 30 dB?
A massive Primary 5/6 PSLE Science Reality Lab guide to decibel displays: learn why the dB scale is logarithmic, so 60 dB is not merely twice the sound intensity of 30 dB, and why weighting, distance and measurement conditions matter.
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PSLE Science Reality Lab Vol No.180 | “Solar Panel Rated 400 W” — Does It Produce 400 W All Day?
A massive Primary 5/6 PSLE Science Reality Lab guide to solar-panel ratings: learn why a 400 W nameplate is a standard-condition power rating, not a promise of 400 W all day or a fixed amount of energy regardless of sunlight and temperature.
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PSLE Science Reality Lab Vol No.179 | “Water Hardness = 180 mg/L as CaCO₃” — Is There 180 mg/L of Calcium Carbonate in the Water?
A massive Primary 5/6 PSLE Science Reality Lab guide to water-hardness reports: learn why “180 mg/L as CaCO₃” is an equivalent hardness reporting basis, not automatic proof that 180 mg/L of calcium carbonate itself is dissolved in the water.
