Category: Science

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PSLE Science Reality Lab: learn how to read an N-P-K fertilizer grade by checking the label convention, chemical basis, denominator and evidence boundary before treating 10-10-10 as three elemental percentages or a plant-growth guarantee.

PSLE Science Reality Lab Vol No.314 | “Sea-Surface Height Anomaly = +10 cm” — Is the Ocean 10 cm Higher Everywhere?

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A massive Primary 5/6 PSLE Science Reality Lab guide to sea-surface height anomaly: why +10 cm is a local difference from a reference, not ocean depth, wave height or a +10 cm global rise, and how to read satellite anomaly maps.

PSLE Science Reality Lab Vol No.313 | “Cloud Optical Thickness = 20” — Is the Cloud 20 km Thick?

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A massive Primary 5/6 PSLE Science Reality Lab guide to cloud optical thickness: why a value of 20 is an optical attenuation quantity, not a cloud that is 20 km thick, and how retrievals, pixels and model limits bound the claim.

PSLE Science Reality Lab Vol No.312 | “Leaf Area Index = 3” — Does That Mean Three Leaves per Square Metre or 300% Ground Cover?

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A massive Primary 5/6 PSLE Science Reality Lab guide to Leaf Area Index: why LAI = 3 is an area ratio, not three leaves per square metre or 300% canopy cover, and how scale, composites and retrieval quality bound the claim.

PSLE Science Reality Lab Vol No.311 | “Transit Depth = 1%” — Is the Planet 1% as Wide as Its Star?

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A massive Primary 5/6 PSLE Science Reality Lab guide to exoplanet transit depth: why a 1% dip in starlight is not a planet that is 1% as wide as its star, and how geometry, stellar size, dilution and repeated evidence bound the inference.

PSLE Science Reality Lab Vol No.310 | “CO₂ = 800 ppm” — Is That 800 mg of CO₂ per Cubic Metre?

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