Category: Science
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PSLE Science Reality Lab Vol No.186 | “Wind Direction = 270°” — Is the Wind Blowing Toward the West?
A Primary 5/6 PSLE Science Reality Lab guide to wind-direction reports: learn why 270° means wind coming from the west, not travelling toward the west, and how to read weather arrows, degrees and averages correctly.
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PSLE Science Reality Lab Vol No.185 | “Sea-Level Pressure = 1013 hPa” — Did the Weather Station Directly Measure 1013 hPa?
A Primary 5/6 PSLE Science Reality Lab guide to weather pressure: learn why mean sea-level pressure is a reduced comparison value, not always the raw pressure directly measured at the station.
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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.
