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7 equations every engineer should understand, not just know:
1. F = ma (Newton's Second Law)
Force = mass × acceleration.
Everything that moves or is prevented from moving obeys this. Every structural load, every vehicle dynamics problem, every rocket trajectory.
2. σ = F/A (Stress)
Stress = force ÷ area.
How concentrated a force is. A small force on a tiny area can be catastrophic. A huge force spread across enough area is manageable. This is why needles pierce and snowshoes don't sink.
3. Q = mcΔT (Heat transfer, sensible heat)
Heat energy = mass × specific heat capacity × temperature change.
How much energy it takes to heat or cool something. Every thermal system, every HVAC calculation, every cooling loop.
4. P = IV (Electrical power)
Power = current × voltage.
Why high-voltage transmission lines lose less energy than low-voltage ones. Why your phone charger gets warm. Every electrical system.
5. PV = nRT (Ideal Gas Law)
Pressure × volume = moles × gas constant × temperature.
How gases behave. Every engine, compressor, pneumatic system, and pressurised vessel.
6. ΔS ≥ 0 (Second Law of Thermodynamics)
Entropy of a closed system never decreases.
Why you can't build a perpetual motion machine. Why every energy conversion produces waste heat. Why engineering is fundamentally about managing irreversibility.
7. E = mc² (Mass-energy equivalence)
Energy = mass × speed of light².
The basis of nuclear engineering. Why a tiny amount of mass releases enormous energy. The equation that explains why uranium powers submarines for 25 years.
You don't need to solve these every day.
You need to feel them, to know when a system is violating one of them.
That's engineering intuition.
@EvaVlaar@SaveEuropeAct When a crowd of people doesn't want to see the truth under their noses
There's nothing to help them
Eva, know that you have support anywhere in the world, you are for the right cause 🤝
We are one step ahead