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Triple point: Quiz

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Question 1: The triple point of water is used to define the kelvin, the ________ base unit of thermodynamic temperature.
Systems of measurementMetric systemInternational System of UnitsConversion of units

Question 2: At pressures below the triple point, such as those that occur in ________, where the pressure is near zero, liquid water cannot exist.
VacuumUniverseSunOuter space

Question 3: Note that even if the total pressure of a system is well above triple point of water, provided the ________ of the water vapour is 611.73 pascals then the system can still be brought to the triple point of water.
NitrogenVapor pressurePartial pressureChemistry

Question 4: More recent missions use ________ and gravity measurements instead of pressure to define elevation on Mars.
Lightning detectionWeather radarLIDARMeteorology

Question 5: In thermodynamics, the triple point of a substance is the temperature and pressure at which three phases (for example, ________, liquid, and solid) of that substance coexist in thermodynamic equilibrium.
AtomGasThermodynamic temperatureSpecific heat capacity

Question 6: The triple points of several substances are used to define points in the ________ international temperature scale, ranging from the triple point of hydrogen (13.8033 K) to the triple point of water (273.16 K).
HeliumOxygenMercury (element)International Temperature Scale of 1990

Question 7: When it is a water-based cell, a special ________ composition called VSMOW is used because it is very pure and produces temperatures that are more comparable from lab to lab.
Stable nuclideIsotopeAtomTechnetium

Question 8: National Bureau of Standards (now ________).
National Institute of Standards and TechnologyNational Oceanic and Atmospheric AdministrationNational Technical Information ServiceBureau of Industry and Security







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