The Phase Diagram for Helium-4 Indicates That

question 16

Multiple Choice

The phase diagram for helium-4 indicates that

• A) helium has three phases.
• B) helium has two liquid phases.
• C) helium can be liquefied at ordinary pressures.
• D) helium exists as He(g) and He(l) at about 2 K.
• E) helium exists only as a gas.

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Definitions:

Standard Deviation

It quantifies the spread of a dataset, illustrating how much individual data points diverge from the mean value.

Z-score

A measure of how many standard deviations an element is from the mean; used in statistics for standardizing scores.

Symmetrical Area

An area where two sections of a distribution or figure are mirror images of each other, indicating balance around a central point.

Value

The significance or worth of something, often numerical, but can also be qualitative in context such as moral values.