Category: Science
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PSLE Science Reality Lab Vol No.308 | “WBGT = 30°C” — Did One Thermometer Measure 30°C Air?
A massive Primary 5/6 PSLE Science Reality Lab guide to Wet Bulb Globe Temperature: why WBGT in °C is a derived heat-stress metric, not an ordinary air-temperature reading from one thermometer.
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PSLE Science Reality Lab Vol No.307 | “Noise Dose = 100%” — Is the Sound Level 100 dBA?
A massive Primary 5/6 PSLE Science Reality Lab guide to noise-dose percentages: why 100% dose is accumulated exposure against a stated criterion, not a 100 dBA sound-level reading.
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PSLE Science Reality Lab Vol No.306 | “Base Peak = 100” — Is the Sample 100% That Fragment?
A massive Primary 5/6 PSLE Science Reality Lab guide to mass-spectrum base peaks: why relative intensity 100 is a normalization reference, not 100% sample composition, and how fragmentation, ionisation, m/z labels and reference spectra bound the claim.
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PSLE Science Reality Lab Vol No.305 | “1000× Magnification” — Does That Mean 1000× More Detail?
A massive Primary 5/6 PSLE Science Reality Lab guide to microscope magnification claims: why 1000× enlargement does not guarantee 1000× more detail, and how resolution, numerical aperture, wavelength, focus and specimen quality set the evidence limit.
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PSLE Science Reality Lab Vol No.304 | “RSD = 2%” — Does That Mean the Method Is 98% Accurate?
A massive Primary 5/6 PSLE Science Reality Lab guide to relative standard deviation: why RSD = 2% describes the relative spread of repeated results, not 98% accuracy, and how precision, bias, references and replication change the claim.
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PSLE Science Reality Lab Vol No.303 | “SPAD = 40” — Is the Leaf 40% Chlorophyll?
A massive Primary 5/6 PSLE Science Reality Lab guide to SPAD chlorophyll-meter readings: why SPAD = 40 is an optical index rather than 40% chlorophyll, and how leaf position, anatomy, repeated readings and calibration control what the number can support.
