Figure 1 shows a linear elastic, thin, freestanding, planar membrane with radius, *a*, thickness, *h*, elastic modulus, *E*, and Poisson's ratio, *v*, clamped at its periphery. It is initially free of residual stress and possesses a negligible flexural rigidity. The deformation is therefore dominated by membrane stretching with negligible plate bending. A rigid plate is placed at a distance, *w*_{0}, from the substrate to restrict the blister height. A uniform pressure, *p*, is applied to form a free bulging blister. Further increase in *p* causes the membrane to adhere to the constraining plate, making a contact circle with radius, *c*, contact angle, **θ**, and deformed annular profile of *w*(*r*). A force *F* exerting on the plate maintains the desirable *w*_{0}. Upon depressurization, simultaneous measurements of *p* and *c* allow the adhesion energy, **γ**, to be deduced. A thermodynamic energy balance based on small elastic strain approximation is used to derive the adhesion–detachment trajectory. Table 1 lists all the physical (bold) and normalized (plain) variables to be used hereafter.