Laboratornaia Rabota 3 Opredelenie Poverkhnostnogo Natiazheniia Zhidkosti Po Fizike 10 Klass Otvety May 2026

In the Russian Grade 10 physics curriculum (typically following the Myakishev textbook ), focuses on measuring the surface tension coefficient ( ) of a liquid—usually water. 🧪 Quick Lab Overview: Method of Drops

. For pure water at room temperature, your result should be close to the reference value of . 💡 Typical "Check Your Knowledge" Answers

The most common method for this lab is the , which relies on the balance of gravity and surface tension forces at the moment a drop breaks away from a tube. Objective: Determine the surface tension of water. Formula: = mass of one drop. = acceleration due to gravity ( = internal diameter of the pipette or tube. 📝 Step-by-Step Execution 1. Gather Equipment In the Russian Grade 10 physics curriculum (typically

Students often need to answer control questions to complete the report: Answer Summary

Surface tension forces act to minimize the surface area for a given volume, and a sphere has the smallest surface area. ⚠️ Common Errors to Avoid 💡 Typical "Check Your Knowledge" Answers The most

Soap is a surfactant (PAV) that significantly the surface tension of water. Why do drops form spheres?

You will need a pipette or medicine dropper, a beaker of water, a small empty beaker for collecting drops, sensitive scales (electronic or balance), and a caliper (shtangentsirkul) to measure the tube diameter. 2. Measure the Diameter Use the caliper to measure the inner diameter of the dropper tip. Convert this value to meters ( 3. Collect Data Weigh the empty beaker ( M1cap M sub 1 Carefully count exactly drops (e.g., 50 or 100 drops) into the beaker. Weigh the beaker with the water ( M2cap M sub 2 Calculate the total mass of the water: Calculate the mass of a single drop: 4. Calculate Plug your values into the formula: = acceleration due to gravity ( = internal

It is determined by the strength of intermolecular attraction; different molecules "stick" together with different forces.