Author: eduKate Asia
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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.
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PSLE Science Reality Lab Vol No.302 | “OD600 = 1.0” — Does That Mean Exactly One Billion Cells per Millilitre?
A massive Primary 5/6 PSLE Science Reality Lab guide to OD600 growth charts: why optical density is a useful proxy for microbial culture density, not a universal exact cell count, and how blanking, range, viability, organism and instrument calibration shape the conclusion.
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PSLE Science Reality Lab Vol No.301 | “Passed 1,000 Hours of Salt Spray” — Does That Mean 1,000 Hours of Real-World Life?
A massive Primary 5/6 PSLE Science Reality Lab guide to salt-spray and accelerated-corrosion claims: why 1,000 test hours are not automatically 1,000 outdoor hours or a fixed service life, and how method, specimen, failure criterion and field correlation control the conclusion.
