a	Radius of the circular membrane
h	Thickness of the circular membrane
E	Young’s modulus of elasticity
ν	Poisson’s ratio
H	Height of the liquid in the storage container
ρ	Density of the liquid in the storage container
g	Acceleration of gravity
r	Radial coordinate of the cylindrical coordinate system (r, φ, w)
φ	Circumferential angle coordinate of (r, φ, w)
w	Axial coordinate of (r, φ, w) as well as transverse displacement
u	Radial displacement of the deflected circular membrane
w m	Maximum deflection of the deflected circular membrane
q(r)	Transverse loads that varies continuously with the radial coordinate r
F(r)	External force produced by q(r) within radius r
σ r	Radial stress
σ t	Circumferential stress
e r	Radial strain
e t	Circumferential strain
θ	Rotation angle of the deflected circular membrane
π	Pi (ratio of circumference to diameter)
W	Dimensionless transverse displacement (w/a)
S r	Dimensionless radial stress (σr/E)
S t	Dimensionless circumferential stress (σt/E)
H 0	Dimensionless height H (H/a)
G	Dimensionless quantity (ρga2/Eh)
x	Dimensionless radial coordinate (r/a)
C	Capacitance of a non-parallel plate capacitor
D	Initial gap of the non-parallel plate capacitor
b i	Coefficients of the power series for capacitance C
c i	Coefficients of the power series for Sr
d i	Coefficients of the power series for W