Q&A for How to Measure Surface Tension

No. Pennies have a very dense and heavy surface rather than water droplets or pins.

If the fluid in the pipette's exit flowed out, it would create a near vacuum, sucking the liquid back in. No gas can replace the liquid, so the only gas available attempts to fill the space. This creates the sucking force (like the principle of the vacuum cleaner) that keeps the liquid in place.

Use a capillary tube that has a small inner radius. Moreover, use a travelling microscope for better readings and therefore better results.

These mean Newtons per meter and Newtons per gram, respectively.

A smaller straw will be easier. The experiment was also using the incorrect number for density of water which should be 1000kg/m3 not 1kg, so in the example given water would only rise 0.5mm not 50cm.

This is a valid point - the contact angle needs to be 90 degrees to the surface of the water.