| Front | Specific Heat Capacity |
| Back | The amount of heat energy required to raise Temperature of 1Kg of substance by 1Kc = ∆Q/m∆Tc = specific heat capacity of the substance ∆Q = amount of heat energy required in Kj m = mass of the substance being heating in KG∆T = change in temperature in Kelvin (K) Remember 1C is equal in magnitude to 1K1kcal = 4.18KJ Specific heat capacity of water = 4.18 kj/kg/K |
| Front | The Poynting Effect |
| Back | Bubbling oxygen through liquid nitrous oxide Nitrous oxide during this is below its critical temperature and above its critical pressureThe Poynting Effect allows this to occur --> Combining gases reduces critical temperature of the mixture to -7C at 137 bar--> Reducing the temperature of the entonox cylinder to below -7C, liquifaction of N2O could take place - Nitrous oxide would then liquefy and separate from oxygen (lamination / separation) - Less likely to happen at higher or lower pressures - Pipeline pressure of 4bar, the pseudocritical temperature is lowered to -30C |
| Front | Critical Temperature and Critical Pressure |
| Back | Critical Temperature - The temperature above which a substance cannot be liquified however much pressure is addedCritical Pressure- The pressure required to liquify a substance at its critical temperature |