1. Science Module Unit 4.6

2. The specific heat capacity of a solid or liquid is defined as the heat required to raise unit mass of substance by one degree of temperature. This can be stated by the following equation:

3. where, Q= Heat supplied to substance, m= Mass of the substance, c= Specific heat capacity, T= Temperature rise. Specific Heat Gases There are two definitions of Specific Heat for vapors and gases: c p = Specific Heat at constant pressure (kJ/kg o C) c v = Specific Heat at constant volume (kJ/kg o C)

4. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C Gas Constant The gas constant can be expressed as R = c p - c v where R = Gas Constant Ratio of Specific Heat The Ratio of Specific Heat is expressed k = c p / c v

5. A unit that is defined by simple combination of base units. There are 18 derived units in the SI system. These are listed in the table below.

6. frequencyhertzHz energyjouleJ forcenewtonN powerwattW pressurepascalPa electric chargecoulombC electrical resistanceohmΩ electrical conductancesiemensS electrical capacitancefaradF magnetic fluxweberWb inductancehenryH magnetic flux densityteslaT luminous fluxlumenlm illuminanceluxlx

7. 1. Calculate the amount of heat needed to increase the temperature of 250g of water from 20 o C to 46 o C? 37,620J or 38kJ 2. What is the heat in Joules required to raise the temperature of 25 grams of water from 0 °C to 100 °C? What is the heat in calories? 10450J, 2500 calories

8. 3. It takes 487.5 J to heat 25 grams of copper from 25 °C to 75 °C. What is the specific heat in Joules/g·°C? 0.39 J/g·°C