There are two parts to this:pranjal verma said:
I am Interested in determining the system on which the forces are acting and how the forces influence the contact angle of the drop.(I.e why liquid forms a specific contact angle due to resultants of all forces acting on it?)haruspex said:
I might have been of help with the shape elsewhere but I know little about contact angles.pranjal verma said:
You can write what ever you know about shape of drops,I will like to learn it as well.haruspex said:
Consider a horizontal disc of the drop, height y, thickness dy, radius x.pranjal verma said:
The surface tension of a liquid is the force that holds the molecules of the liquid together. In the case of water and mercury, water has a higher surface tension than mercury, meaning that it is more resistant to being pulled apart. This results in a more spherical shape for a water droplet on a glass slide compared to a mercury droplet, which will spread out more due to its lower surface tension.
Gravity plays a significant role in determining the shape of a liquid droplet on a surface. The force of gravity pulls the droplet downwards, causing it to spread out and flatten. However, the surface tension of the liquid counteracts this force, resulting in a balance between gravity and surface tension that determines the shape of the droplet.
Yes, the contact angle, which is the angle at which the liquid meets the surface of the glass slide, can have a significant impact on the shape of the droplet. A higher contact angle means the liquid is less likely to spread out and will form a more spherical shape, while a lower contact angle will result in a flatter, more spread-out droplet.
External forces, such as air currents, can cause disturbances in the surface tension of a liquid droplet, leading to changes in its shape. For example, a slight breeze may cause the droplet to deform or even break apart, while a more stable environment will result in a more consistent shape.
Yes, there are several other factors that can influence the shape of a droplet on a glass slide. These include the viscosity (thickness) of the liquid, the temperature, and the size and material of the glass slide itself. Additionally, impurities or contaminants in the liquid can also affect its surface tension and therefore impact the droplet's shape.
