A science teacher asks her students to put two drops each of oil and sugar solution on a flat surface. She then asks them to tilt the surface and observe the order in which the drops reach the bottom. Which property of liquids is the teacher trying to bring to the students' attention through this activity?

Why does a small droplet of liquid naturally assume a spherical shape?

The surface tensions of two liquids having the same density, T1 and T2, are measured using the capillary rise method. Two tubes with inner radii of r1 and r2 are used, where r1 > r2. If the measured liquid heights in these tubes are h1 and h2 respectively, and it is found that T1 = T2, then which of the following relations is correct? (Ignore the weight of the liquid above the lowest point of the meniscus.)