At an air–water interface, the attractive forces between the water molecules, known as

, make the water lining like a stretched balloon that constantly tends to shrink and resists further stretching.

Question

At an air–water interface, the attractive forces between the water molecules, known as 
 
, make the water lining like a stretched balloon that constantly tends to shrink and resists further stretching.

BlackTom AI · Accepted Answer

The question asks to fill in two blanks in the sentence: 'At an air–water interface, the attractive forces between the water molecules, known as _____, make the water lining like a stretched balloon that constantly tends to shrink and resists further stretching.'

Option 空白1: If you place 'surface' in the first blank, the phrase reads 'the attractive forces between the water molecules, known as surface, ...' In this context, 'surface' alone does not name the cohesive phenomenon; the typical term used to describe the cohesive forces at an interface is 'surface tension,' not just 'surface.' So using only 'surface' for the first blank would be incomplete and misleading.

Option 空白2: If you place 'tension' in the second blank, the phrase would read '... known as tension, make the water lining like a stretched balloon ...' Without the preceding 'surface,' this would read awkwardly and omit the standard compound term used in surface science. 'Tension' by itself does not identify the specific interfacial phenomenon.

In this wiring, the scientifically correct pair is to fill the two blanks with 'surface' (first blank) and 'tension' (second blank), yielding the conventional term 'surface tension,' which describes the cohesive forces at the air–water interface that make the surface behave like a stretched film tending to shrink.

Why the common misconceptions fail:
- If someone thinks only 'surface' is enough, they miss identifying the specific interfacial force at play; 'surface' refers to the interface concept, not the force magnitude or nature.
- If someone thinks only 'tension' is enough, they lose the context of where this force acts and what it is called in the literature—'surface tension' names the phenomenon arising from cohesive forces at an interface.

Therefore, the intended scientific term is the two-word phrase 'surface tension,' aligned with the two blanks being filled in order with 'surface' and then 'tension.'

At an air–water interface, the attractive forces between the water molecules, known as , make the water lining like a stretched balloon that constantly tends to shrink and resists further stretching.

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