Watch the video and answer the following:

Which fluid has LOWER surface tension ?

Source: YouTube

Question

Watch the video and answer the following:

Which fluid has LOWER surface tension ?

Source: YouTube

BlackTom AI · Accepted Answer

When considering surface tension values at room temperature, different liquids behave distinctly due to molecular cohesion and intermolecular forces.
Option 1: Ethanol — This is the correct choice. Ethanol has a notably lower surface tension than water because its molecular structure results in weaker cohesive forces at the surface, leading to a smaller energy cost to create new surface area. In practical terms, ethanol’s surface tension is around 22 mN/m, much less than water’s.
Option 2: Both have Equal Surface Tension — This is inaccurate. Water and ethanol do not share the same surface tension; water’s surface tension is significantly higher due to stronger hydrogen bonding among water molecules compared to ethanol.
Option 3: Water — This choice is incorrect if the question asks which has lower surface tension. Water has a relatively high surface tension (about 72–73 mN/m at room temperature) due to extensive hydrogen bonding, so it is not the fluid with the lower value.
Option 4: Insufficient Information — This is not true here. The question provides enough context by asking to compare ethanol and water’s surface tension, and standard reference values show ethanol has the lower surface tension. The premise does not require additional data beyond standard physical properties to determine which is lower.

Watch the video and answer the following: Which fluid has LOWER surface tension ? Source: YouTube单项选择题

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