Category: Science
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PSLE Science Reality Lab Vol No.198 | “Dissolved Oxygen = 80% Saturation” — Is 80% of the Water Oxygen?
A massive Primary 5/6 PSLE Science Reality Lab guide to dissolved-oxygen percent saturation: learn why 80% saturation does not mean 80% of water is oxygen, why temperature, pressure and salinity matter, and how to keep water-quality claims inside the evidence.
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PSLE Science Reality Lab Vol No.197 | “Water Activity = 0.85” — Is the Food 85% Water?
A massive Primary 5/6 PSLE Science Reality Lab guide to water activity: learn why aw = 0.85 is not 85% water by mass, how it differs from moisture content, and how to interpret the measurement without turning it into food-safety advice.
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PSLE Science Reality Lab Vol No.196 | “100 CFU/mL” — Does That Mean Exactly 100 Microbial Cells in Every Millilitre?
A massive Primary 5/6 PSLE Science Reality Lab guide to colony-forming units: learn why 100 CFU/mL is a culture-based estimate, not automatically an exact count of 100 individual microbial cells in every millilitre.
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PSLE Science Reality Lab Vol No.195 | “Energy Use = 350 kWh/year” — Will Every Home Use Exactly 350 kWh?
A massive Primary 5/6 PSLE Science Reality Lab guide to appliance energy labels: learn why 350 kWh/year is a standardized estimate for comparison, not a guarantee that every household will use exactly that amount.
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PSLE Science Reality Lab Vol No.194 | “Battery Capacity = 5000 mAh” — Does It Supply 5000 mA for Exactly One Hour?
A massive Primary 5/6 PSLE Science Reality Lab guide to battery labels: learn why 5000 mAh is a charge-capacity rating, not a guaranteed 5000 mA current, one-hour runtime or complete energy value.
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PSLE Science Reality Lab Vol No.193 | “Cooling Capacity = 12,000 Btu/h” — Does the Air Conditioner Use 12,000 Btu of Electricity Each Hour?
A massive Primary 5/6 PSLE Science Reality Lab guide to air-conditioner labels: learn why cooling capacity in Btu/h describes heat-removal rate, not the electrical energy the unit consumes each hour.
