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The triple point of a substance is the temperature and pressure at which the substance exists as which of the following?

Rationale

Simultaneously in solid, liquid, and gas phases is the state at which a substance exists at its triple point.

The triple point of a substance is a specific temperature and pressure where the three phases of matter - solid, liquid, and gas - coexist in thermodynamic equilibrium. This unique condition is used to define the Kelvin temperature scale.

A (As a gel with solid and liquid trapped in gas) YOUR ANSWER

This statement is incorrect as it introduces the concept of a gel, which is not a fundamental state of matter. The triple point only involves the basic states of matter, namely solid, liquid, and gas.

B (Simultaneously in sol, gel, and plasma phases) YOUR ANSWER

This option is incorrect as it includes sol and gel, which are not considered primary states of matter, and excludes the liquid state. Additionally, it introduces plasma, which is not involved in the triple point of a substance.

C (Simultaneously in solid, liquid, and gas phases) CORRECT

This is the correct answer. The triple point is a specific state where a substance can exist in all three fundamental states of matter simultaneously - solid, liquid, and gas.

D (As a sol with gas and solid trapped in liquid) YOUR ANSWER

This statement is incorrect as it introduces the concept of a sol, which is not a fundamental state of matter. The triple point only involves the basic states of matter: solid, liquid, and gas.

Conclusion

A substance's triple point is a unique set of conditions at which it can exist simultaneously in the solid, liquid, and gas states. The other options introduce non-fundamental states of matter (gel and sol) or exclude one of the primary states required for a triple point (liquid). The understanding of a substance's triple point is essential in thermodynamics and is used to define the Kelvin temperature scale.

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