| The density of dry gels was determined by hydrostatical weighing by kit YDK 01LP in ethanol. |
| In the hydrostatical version the external pressure is directly linked to the free surface, and the internal pressure is due to the density differences. |
| A hydrostatical pressure difference between the start from the photosphere and the landing on the photosphere is clearly impossible. |
| Achievements include his calculations on the area of the surface of a sphere, geometrical analysis of statical and hydrostatical problems and the use of statics in geometry. |
| The above configuration leads to a hydrostatical compensation of the pressing force exerted by the medium. |
