Science
2 min
CrispFacts / Subject index
Science
Clear distinctions between scientific terms, measurements, and evidence, with examples that show where each explanation applies.
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Science4 min
Why 90% Humidity Can Describe a Cold Morning
Relative humidity depends on temperature. Dew point adds the context needed to compare how much moisture the air contains. -
Science6 min
Watts and Kilowatt-Hours Measure Different Things
Work from a power label to accumulated energy, then compare cycling appliances, task duration, and the energy portion of a bill. -
Science4 min
Why a Kilogram Stays a Kilogram When Gravity Changes
Separate mass, gravitational force, and the number displayed by a scale, with an Earth-and-Moon calculation. -
Science5 min
Rock, Mineral, and Fossil: Three Labels That Answer Different Questions
A specimen can contain minerals and preserve a fossil at the same time. Separate composition, rock type, and evidence of past life when reading a display or identification. -
Science9 min
Density and Buoyancy: Why a Heavy Object Can Float
Floating depends on the mass of displaced fluid and the whole object, not simply whether its material feels heavy. Work through density, volume, and force with bounded examples. -
Science8 min
Speed, Velocity, and Acceleration: What Changes When Direction Changes
A constant speed can still involve acceleration. Use round trips, signed directions, and simple graphs to separate distance, displacement, and changes in velocity. -
Science6 min
pH and Alkalinity Are Different Measurements of Water
pH describes hydrogen-ion activity on a logarithmic scale. Alkalinity concerns acid-neutralizing capacity. Learn what the numbers do and do not establish. -
Science5 min
Solstice, Equinox, and Season: Why the Calendar Has More Than One Boundary
Astronomical events and meteorological seasons divide the year differently. Understand hemispheres, daylight, and date conventions without treating a season boundary as a weather forecast. -
Science4 min
More Decimal Places Do Not Automatically Mean a Better Measurement
Use a scale example to distinguish display resolution, repeatability, bias, and measurement accuracy. -
Science4 min
A Hot Cup and a Warm Bath: What Temperature Leaves Out
Temperature describes thermal state; energy transfer also depends on the material, amount, and change being considered. -
Science9 min
Energy Conservation and Efficiency: Where “Lost” Energy Goes
Energy can be conserved while a device is inefficient. Track a system boundary, useful output, and transfers to understand loss, storage, and heat-pump claims.