A method for measuring mechanical (undrained shear strength, residual shear strength, remolded shear strength, sensitivity, brittleness) and rheological (viscosity, yield stress, thixotropic) properties of soil, the method comprising: providing a measuring apparatus comprising a rotatable vane blade; inserting the vane blade into the soil at a first depth; during a first period of time, accelerating the rotational speed of the vane blade; during a second period of time, decelerating the vane blade while measuring the torque applied to the vane blade and the rotational speed of the vane blade; determining a relationship between the torque and the rotational speed; and determining rheological properties of the soil at the first depth based on the relationship between the torque and the rotational speed.

An apparatus and a method arranged for measuring a rheological and/or interfacial property comprising: a pressure unit arranged for providing a quantity of a gas at a predetermined pressure to a surface of the fluid; a detection unit arranged for detecting a surface deformation of the fluid, due to the pressurized gas at a plurality of locations at the surface of the fluid; a reference register comprising reference data related to surface deformations of respective fluids, and related to known rheological and/or interfacial properties of the respective fluids; a determining unit arranged for: receiving the detected surface deformation from the detection unit; accessing the reference data of the reference register; determining respective correlations between the detected surface deformation, and the surface deformations of the respective fluids from the accessed reference data; and identifying a fluid of the respective fluids of the reference data based on a maximum correlation among the determined respective correlations; and an output unit arranged for outputting the rheological and/or interfacial property respectively corresponding with the fluid identified by the determining unit. A method for measuring a rheological and/or interfacial property of a fluid.