Author: eduKate Asia
-
PSLE Science Reality Lab Vol No.423 | “4-Tick WELS Washing Machine” — Does Four Ticks Mean It Uses One Quarter as Much Water?
A massive Primary 5/6 evidence guide to Singapore’s WELS label: why four water-efficiency ticks are a category-specific grade under stated test conditions, not a literal promise that a washing machine uses one quarter as much water in every home.
-
PSLE Science Reality Lab Vol No.422 | “Sample Rate = 1 Reading/s” — Can the Sensor Track Every One-Second Change?
A massive Primary 5/6 evidence guide to sensor datasheets: why one reading per second tells you how often values are produced, not how quickly the physical sensor can follow a changing quantity.
-
PSLE Science Reality Lab Vol No.421 | “Accuracy = ±2% RH at 23°C” — Does That Same Accuracy Claim Apply at Every Temperature?
A massive Primary 5/6 evidence guide to instrument specifications: why an accuracy statement tied to 23°C or another test condition should not be silently extended to every operating condition.
-
PSLE Science Reality Lab Vol No.420 | “Aboveground Biomass = 150 Mg/ha” — Did Scientists Cut Down and Weigh Every Tree?
A massive Primary 5/6 evidence guide to forest biomass maps: how field observations, lidar measurements, sampling and models can produce biomass estimates without weighing every tree in every mapped area.
-
PSLE Science Reality Lab Vol No.419 | “River Discharge = 120 m³/s at 06:00” — Was 120 m³/s Directly Measured at That Exact Moment?
A massive Primary 5/6 evidence guide to river-discharge dashboards: why a value shown at one timestamp may be estimated from continuously measured stage and a site-specific rating curve rather than directly measured at that exact moment.
-
PSLE Science Reality Lab Vol No.418 | “Net Weight 500 g” — Was Every Pack Filled to Exactly 500.0 g?
A massive Primary 5/6 evidence guide to net-weight labels: why a printed 500 g declaration does not prove every individual package was filled to exactly 500.0 g.
