$\frac{\partial \mathrm{q}}{\partial {\mathrm{x}}_1},\frac{\partial \mathrm{q}}{\partial {\mathrm{x}}_2},..., \frac{\partial \mathrm{q}}{\partial {\mathrm{x}}_{\mathrm{n}}}$	Partial differential of calculated parameter q which depends on different measured variables x1, x2,…,xn.
$\dot{\mathrm{m}}$	Mass flow rate of fluid/species/fuel, kg/s
$\dot{\mathrm{R}}$	Universal gas constant, J/mol-K
MB	Microalgae-biodiesel
ASTM	American Standard Testing Method
BSFC	Brake specific fuel consumption, kg/kWh
BTE	Brake thermal efficiency, %
CHRR	Cumulative heat release rate, J/cycle
CI	Compression ignition
CO	Carbon monoxide
D	Diesel
Fspecies	Mole fraction of exhaust gas species (CO, HC and NOx)
FFA	Free fatty acid
HC	Hydrocarbon emission, g/kWh
HRR	Heat release rate, J/⸰CA
JB	Jatropha-biodiesel
MW	Molecular weight
N	Engine speed, rpm
NDIR	Nondispersive infrared
NOx	Oxides of nitrogen, g/kWh
p	In-cylinder pressure
P	Rated power, kW
PB	Polanga biodiesel
Q	Heat release rate, kJ
R	Characteristic gas constant
T	Temperature, K or oC
U	Internal energy, J
$\mathit{\theta }$	Degree crank angle