Physics Content Validator

Electromagnetic Constants

Particle Masses

SI Units Validation

Base SI Units

Derived SI Units (Common in Physics)

Common Unit Errors to Avoid

❌ Wrong: "Energy is measured in watts" ✅ Correct: "Power is measured in watts; energy is measured in joules"

❌ Wrong: "Mass in grams" ✅ Correct: "Mass in kilograms (kg is the SI base unit)"

❌ Wrong: "Temperature in Celsius" ✅ Correct: "Temperature in kelvin (K is the SI base unit; °C is derived)"

❌ Wrong: "Force = ma newtons" ✅ Correct: "Force = ma, measured in newtons (N)"

Equation Validation Checklist

Classical Mechanics

✅ Correct Equations:

• Newton's 2nd Law: F = ma
• Kinetic Energy: E_k = ½mv²
• Gravitational Force: F = Gm₁m₂/r²
• Momentum: p = mv

❌ Common Mistakes:

• F = ma² (wrong exponent)
• E_k = mv² (missing ½ factor)
• p = m/v (inverted formula)

Thermodynamics

✅ Correct Equations:

• First Law: ΔU = Q - W (with sign convention)
• Ideal Gas: PV = nRT
• Entropy: ΔS = Q/T (for reversible processes)

❌ Common Mistakes:

• ΔU = Q + W (wrong sign convention - depends on convention used, but be consistent!)
• PV = RT (missing mole count n)

Electromagnetism

✅ Correct Equations:

• Coulomb's Law: F = k_e q₁q₂/r²
• Electric Field: E = F/q
• Ohm's Law: V = IR
• Lorentz Force: F = q(E + v × B)

❌ Common Mistakes:

• F = k_e q₁q₂/r (missing square on r)
• V = I/R (inverted formula)

Quantum Mechanics

✅ Correct Equations:

• Photon Energy: E = hν = ℏω
• de Broglie: λ = h/p
• Uncertainty: Δx·Δp ≥ ℏ/2 (not just ℏ!)
• Schrödinger: iℏ∂ψ/∂t = Ĥψ

❌ Common Mistakes:

• E = ℏν (should be hν, or ℏω)
• Δx·Δp ≥ ℏ (missing /2 factor)
• Omitting the "i" in Schrödinger equation

Relativity

✅ Correct Equations:

• Mass-Energy: E = mc²
• Lorentz Factor: γ = 1/√(1 - v²/c²)
• Energy-Momentum: E² = (pc)² + (m₀c²)²

❌ Common Mistakes:

• E = mc (missing square)
• γ = √(1 - v²/c²) (should be 1/√...)

Common Physics Misconceptions

1. Centrifugal Force

❌ Misconception: "Centrifugal force pulls objects outward in circular motion" ✅ Correct: "Centrifugal force is a fictitious force in rotating reference frames. The real force is centripetal (inward)."

2. Heat vs Temperature

❌ Misconception: "Heat and temperature are the same thing" ✅ Correct: "Heat is energy transfer (measured in joules), temperature is average kinetic energy (measured in kelvin)"

3. Gravity in Space

❌ Misconception: "There's no gravity in space" ✅ Correct: "Gravity exists everywhere; astronauts experience microgravity due to continuous freefall (orbit)"

4. Heisenberg Uncertainty

❌ Misconception: "We can't measure position and momentum because our instruments disturb the particle" ✅ Correct: "Uncertainty is fundamental to quantum mechanics, not a measurement limitation"

5. Speed of Light

❌ Misconception: "Nothing can go faster than light" ✅ Correct (more precise): "Nothing can travel faster than c through spacetime; information cannot travel faster than c"

6. E=mc²

❌ Misconception: "E=mc² only applies to nuclear reactions" ✅ Correct: "E=mc² is universal mass-energy equivalence; applies to all energy (including chemical bonds, heat, etc.)"

7. Conservation of Energy

❌ Misconception: "Energy is never lost" ✅ Correct: "Energy is conserved (not lost), but can be transformed into less useful forms (entropy increases)"

Terminology Validation

Correct vs Incorrect Terms

Content Review Process

When reviewing physics content:

1. Read for comprehension: Does the explanation make sense?
2. Check equations: Are formulas correct and properly formatted?
3. Verify units: Are SI units used consistently?
4. Validate constants: Are physical constants accurate?
5. Confirm terminology: Is physics jargon used correctly?
6. Check for misconceptions: Does content reinforce or debunk common myths?
7. Verify sources: Are claims backed by reputable sources?

Example Validation

❌ Incorrect Content

"The energy of light is measured in watts and depends on its amplitude. The formula is E = hλ where h is Planck's constant and λ is wavelength. Temperature is measured in Celsius."

Problems:

1. Energy is measured in joules, not watts (power)
2. E = hλ is wrong; should be E = hν = hc/λ
3. Temperature SI unit is kelvin, not Celsius

✅ Corrected Content

"The energy of a photon is measured in joules and depends on its frequency. The formula is E = hν (or E = hc/λ), where h = 6.626×10⁻³⁴ J·s is Planck's constant, ν is frequency, and λ is wavelength. For thermodynamic temperature, the SI unit is kelvin (K)."

Red Flags (Immediate Review Needed)

🚩 Equations without units specified 🚩 Constants without values or incorrect values 🚩 "Heat energy" vs "thermal energy" (be precise) 🚩 Mixing different unit systems (SI + imperial) 🚩 Claiming something is "impossible" in physics (usually nuanced) 🚩 Missing significant figures in calculations 🚩 Confusing vectors and scalars (F vs |F|)

Validation Checklist

Before publishing physics content:

• All equations use correct formulas
• LaTeX notation is accurate
• SI units used consistently
• Physical constants have correct values
• No common misconceptions reinforced
• Terminology is technically correct
• Claims are scientifically accurate
• Sources cited where appropriate
• Dimensional analysis checks out
• Sign conventions explained (where relevant)

Resources for Verification

1. NIST Physical Constants: https://physics.nist.gov/cuu/Constants/
2. SI Units: https://www.bipm.org/en/measurement-units
3. Hyperphysics: http://hyperphysics.phy-astr.gsu.edu/
4. Physics Stack Exchange: https://physics.stackexchange.com/
5. ArXiv: https://arxiv.org/ (for recent research)

Reference

For complete constant values and common mistakes, see:

• physical-constants.md
• si-units.md
• common-mistakes.md