Physics Notes HEAT MEASUREMENT S4.pdf

SSEKWE ROBERT Substance | Specific heat capacity (Jkg-1K-1) | Water | 4200 | Ice | 2100 | Aluminium | 900 | Copper | 400 𝑚 The SI unit of specific heat capacity is Joules per kilogram per Kelvin (J/kgK or Jkg-1K-1). Substance Specific heat capacity (Jkg-1K-1) Water 4200 Ice 2100 Aluminium 900 Copper 400 NOTE: Water has the highest specific heat capacity of 4200Jkg-1K-1. The high specific heat capacity of water makes water a very good liquid for cooling machines. Question: “The specific heat capacity of water is 4200Jkg-1K-1” What is meant by the statement? This means that 1kg mass of water requires 4200J of heat to raise its temperature by 1K. 𝑝 𝑝 𝑦 𝑚𝑜 𝑛 𝑜 HEAT MEASUREMENT Terminologies used: i) Heat capacity, C: This is the amount of heat required to raise the temperature of a body by 1K or 10C. Quantity of heat, Where – change in temperature. Specific heat capacity 𝑚 Mass of substance. Note: N.B: The specific heat capacity is different for different substances and the table below shows values of specific heat capacities of some common substances. 𝑀 ssekwerobert@gmail.com 0752053997 Page 1 The SI unit of heat capacity is joules per Kelvin (J/K or JK-1) Also, 𝑝 𝑦 𝑚 𝑝 𝑝 𝑦 ii) Specific heat capacity, c: This is the amount of heat required to raise the temperature of 1kg mass of a substance by 1K or 10C. 𝑝 𝑦 𝑚𝑜 𝑛 𝑜 𝑛 𝑛 𝑚𝑝 𝑚 ( ) SSEKWE ROBERT 5. 5KJ of heat is supplied to a metal whose specific heat capacity is 400 𝐽𝑘 −1𝐾−1, if the temperature of the metal rises by 5𝐾. Find the m