When the angle of contact between the liquid and container is 90 degrees then the cohesive and adhesive forces in a liquid are equal. Cohesive force is the attraction between similar atoms and adhesive between different atoms.

Surface Tension is the tendency of a fluid to occupy least surface area as possible. It is defined as the force per unit distance. So, the spherical shape that is acquired by a water drop is due to surface tension.

The surface tension in liquids decreases with rise in temperature. As surface tension decreases, molecules become more active when temperature increases and surface tension becomes zero at critical temperature T_C.

The correct answer is Petrol.

• Petrol is a liquid and takes the shape of the container it is in.
• Tungsten and Iron are solid materials that do not change shape based on the container.
• Paper is also a solid and maintains its shape unless physically altered.
• Liquids, unlike solids, have the ability to flow and adapt to the shape of any container.
• Petrol, being a liquid, exhibits properties such as viscosity and surface tension, which are characteristic of liquids.

The correct answer is Liquid.

• Liquids take the shape of the container they are kept in, a property due to their fluidity.
• Unlike solids, liquids have no fixed shape but a fixed volume that doesn't
change with the shape of its container.
• This characteristic allows liquids to flow and conform to the contours of any container.