Category: Science
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PSLE Science Reality Lab Vol No.406 | “Error = +0.3°C; Correction = −0.3°C” — Why Do the Signs Point Opposite Ways?
A massive Primary 5/6 evidence guide to calibration certificates: how to distinguish measurement error, correction and uncertainty, and why a compensating additive correction can carry the opposite sign from the estimated error.
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PSLE Science Reality Lab Vol No.405 | “ISO Class 5 Cleanroom” — Does Class 5 Mean Only Five Particles Are Allowed in the Room?
A massive Primary 5/6 evidence guide to ISO cleanroom classes: why “ISO Class 5” describes airborne-particle cleanliness under a defined concentration-based method, not five particles in the entire room.
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PSLE Science Reality Lab Vol No.404 | “Magnitude 6.1, Then 5.8” — Did the Earthquake Become Smaller After It Happened?
A massive Primary 5/6 evidence guide to revised earthquake magnitudes: why the physical event stays in the past while the scientific estimate can improve as more seismic data and analysis become available.
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PSLE Science Reality Lab Vol No.403 | “Brightness Temperature = −43°C” — Did a Thermometer in the Cloud Measure −43°C?
A massive Primary 5/6 evidence guide to brightness temperature: why a satellite radiometer can report a temperature-like value without directly placing a thermometer in a cloud, surface or air layer.
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PSLE Science Reality Lab Vol No.402 | “Sound Power Level = 90 dB” — Will a Sound Meter Read 90 dB Wherever You Stand?
A massive Primary 5/6 evidence guide to acoustic specifications: why sound-power level characterises a source while sound-pressure level depends on measurement position, distance and environment.
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PSLE Science Reality Lab Vol No.401 | “Gas Flow = 10 Standard L/min” — Are Exactly 10 Litres Passing Each Minute at the Actual Temperature and Pressure?
A massive Primary 5/6 evidence guide to standard gas flow: why standard L/min expresses gas amount on stated reference conditions rather than necessarily the physical volume moving through a line each minute.
