The sinter density of small superconducting BSCCO samples (Bi2Sr2Can−1CunOy;n=1, 2, or 3;yabout 7) was determined by hydrostatic weighing using a special technique to correct the mass data for penetration of immersion liquid. A discontinuity in the reevaporation curve permits one to distinguish between liquid, penetrated into the sample, and that adhering to the surface of the specimen. This allows one to calibrate by wiping away of excess liquid without fluid extraction out of sample pores. ©1995 American Institute of Physics.