Microcantilevers are the most simplified micromechanical system (MEMS) devices and became recently important for biological and chemical sensing. This project aims in characterizing the changes in frequency response of microcantilevers of various lengths in changing conditions of the environments. Understanding the behavior of microcantilevers in high pressure conditions and relates the frequency response of the microcantilevers to thermodynamical properties of the surrounding fluid can help us inventing new measurement techniques, i.e. for density and viscosity.