Every physics student knows that desperate moment. Clock ticking, sweat forming, and suddenly you're making the ultimate sacrifice: reducing complex equations to first-order approximations. Just like General Hux commanding his troops, you're basically screaming "forget those pesky higher-order terms!" at your equations. The beautiful chaos of real thermodynamic systems reduced to linear relationships because, well, who has time for reality during finals? Your professor later: "I sense a great disturbance in your calculations, as if millions of decimal points suddenly cried out in terror."