Category: Science
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PSLE Science Reality Lab Vol No.250 | “Air Sensor Says PM2.5 = 40” — Is That the Same as a Regulatory Monitor Reading?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on air-sensor evidence: why a compact PM2.5 sensor can be scientifically useful without being automatically equivalent to a regulatory reference monitor, and how location, time, humidity, correction and performance testing change what the reading can support.
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PSLE Science Reality Lab Vol No.249 | “Correlation r = 0.80” — Does That Prove One Variable Causes the Other?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on correlation claims: why r = 0.80 can show a strong linear association without proving causation, 80% accuracy or one causal direction, and what additional evidence can strengthen a causal explanation.
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PSLE Science Reality Lab Vol No.248 | “The Scale Shows 12.34 g” — Is the Mass Accurate to the Nearest 0.01 g?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on digital scale readings: why 0.01 g display steps do not automatically mean ±0.01 g accuracy, and how readability, repeatability, reference checks and measurement conditions change what the digits can support.
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PSLE Science Reality Lab Vol No.247 | “Climate Normal = 30°C” — Is 30°C What the Weather Is Supposed to Be Every Day?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on climate normals: why a long-term normal is a reference baseline rather than a daily forecast or required value, and how base periods, variation and anomalies change what a climate graphic can support.
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PSLE Science Reality Lab Vol No.246 | “One Grab Sample Met the Limit” — Does That Mean the Whole River Met It All Day?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on grab samples: why one passing water sample represents a specific place and time, not automatically an entire river or day, and how repeated, spatial and composite sampling change what a claim can support.
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PSLE Science Reality Lab Vol No.245 | “Satellite Soil Moisture = 0.30” — Does That Describe the Soil All the Way Down to the Roots?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on satellite soil-moisture maps: why a surface soil-moisture value represents a shallow layer and area rather than the whole soil profile, how root-zone products add modelling, and how rain, depth, pixel size and time change what a map can support.
