States of matter

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Question 40
Easy

Four cryogenic refrigerants are being evaluated for an aerospace thermal control system. Their melting and boiling points are listed in Table 1.

Table 1: Melting and boiling points of cryogenic refrigerants

RefrigerantMelting point in ∘C^{\circ}\text{C}∘CBoiling point in ∘C^{\circ}\text{C}∘C
P-120-60
Q-30150
R-80-10
S25300

Give the letter of the refrigerant that is a liquid at −40 ∘C-40\text{ }^{\circ}\text{C}−40 ∘C.

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States of matter Questions

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