The Henry's law constant for argon in water at 25 °C is 1.4×10⁻³ mol/L atm. The Henry's law constant for helium in water at 25 °C is 3.7×10⁻⁴ mol/L atm. Clearly, ______ is more soluble in water at 25 °C, and a partial pressure of ________ atm of argon would yield the same gas concentration in water as 1.00 atm of helium.