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Nano Physics · Foundations & Tools · Units, Dimensions & Measurement

Physical Quantities & SI Units

Learn what a physical quantity really is, how SI base units anchor measurements, and how to express answers cleanly and consistently (final-year high school + first-year university).

Physics · Foundations & Tools · Units, Dimensions & Measurement · Physical Quantities & SI Units
Access for this nano-lesson
Unsigned visitors can show & copy prompts for Steps 1–3. Signed-in free accounts can also Run with AI for Steps 1–2. Paid accounts unlock everything (Steps 1–6 + Help prompts + AI).
Steps 1–3 Free Steps 4–6 Paid
STEP 1
Orient / Definition: what is a “physical quantity” and what is a “unit”?
Free
Build crisp definitions (quantity vs unit vs measurement). Learn the idea “number × unit” and why units are part of the meaning.
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Goal: say what a quantity and unit are without hand-waving.
STEP 2
Conceptual grounding: SI base quantities + how “derived” quantities are built
Free
Learn the SI base units (m, kg, s, A, K, mol, cd), then see how common physics quantities (speed, force, energy) combine them.
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Goal: recognize which base units “hide inside” a formula.
STEP 3
Real-world connection: measurement, prefixes, and unit conversion without mistakes
Free
Understand why conversion factors are “equal to 1,” how prefixes (milli-, kilo-, micro-) work, and how unit mistakes cause real engineering failures.
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Goal: convert units cleanly and explain each conversion factor.
STEP 4
Check your understanding: mini-quiz (answers hidden until you reveal)
Paid
Try each question first. Answers + feedback appear only when you click Reveal answer. This prevents accidental spoilers and builds real exam readiness.
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Goal: spot unit logic errors before they become full solution errors.
STEP 5
Practice: unit reading, conversions, and building derived units
Paid
Practice the moves you’ll use all year: convert prefixes, simplify units in formulas, and check whether an answer’s unit makes sense.
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Goal: treat units as a built-in “error detector.”
STEP 6
Summary & reflection + Exploration / “simulation” prompts
Paid
Consolidate the key takeaways, then explore “what if?” scenarios: swapping units, scaling prefixes, and predicting how numbers change when the unit changes.
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Explore simulation
Goal: summarize + stress-test your unit intuition with quick “what if” checks.