Category: Science

—

by

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?

—

by

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?

—

by

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?

—

by

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?

—

by

A massive Primary 5/6 PSLE Science Reality Lab guide to CO₂ ppm: why 800 ppm is an amount-fraction statement, not 800 mg/m³, and how basis, denominator, instrument method, temperature and pressure bound comparisons.

PSLE Science Reality Lab Vol No.309 | “20 Heating Degree Days” — Were There 20 Cold Days?

—

by