Thermodynamics and Chemistry

CHAPTER 1 INTRODUCTION

1.1 UNITS 20

Table 1.1 SI base units

Physical quantity SI unit Symbol

length metera m

mass kilogram kg

time second s

thermodynamic temperature kelvin K

amount of substance mole mol

electric current ampere A

luminous intensity candela cd

aor metre

Table 1.2 SI derived units

Physical quantity Unit Symbol Definition of unit

force newton N 1 ND 1 m kg s^2

pressure pascal Pa 1 PaD 1 N m^2 D 1 kg m^1 s^2

Celsius temperature degree Celsius C t=CDT=K273:

energy joule J 1 JD 1 N mD 1 m^2 kg s^2

power watt W 1 WD 1 J s^1 D 1 m^2 kg s^3

frequency hertz Hz 1 HzD 1 s^1

electric charge coulomb C 1 CD 1 A s

electric potential volt V 1 VD 1 J C^1 D 1 m^2 kg s^3 A^1

electric resistance ohm  1 D 1 V A^1 D 1 m^2 kg s^3 A^2

Table 1.3 Non-SI derived units

Physical quantity Unit Symbol Definition of unit

volume litera Lb 1 LD 1 dm^3 D 10 ^3 m^3

pressure bar bar 1 barD 105 Pa

pressure atmosphere atm 1 atmD101,325 PaD1:01325bar

pressure torr Torr 1 TorrD.1=760/atmD.101,325/760/Pa

energy caloriec cald 1 calD4:184J

aor litre bor l cor thermochemical calorie dor calth