What is the heat of vaporisation?

单选题 What is the heat of vaporisation?

A、 the heat required to change a gas to a liquid

B、 the heat required to change a liquid to a gas

C、 the heat required to change a solid to a gas

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相关试题

单选题 What is the density value of the air at sea level when there is a temperature of 15°C and a pressure of 101,3 Kpa?

A、0,225 kg/m3

B、1,225 kg/m3

C、5,225 kg/m3

单选题 Which is the value of gravity acceleration?

A、0.981 m/s²

B、12.7 m/s²

C、9.81 m/s²

单选题 What is the compression?

A、Is applied to a material when it is twisted

B、Is the characteristic to resist to an external force that tends to push the object inside

C、The force tending to separate an object

单选题 The force is a:

A、Pure number

B、Scalar

C、Vector

单选题 What is n in the law of perfect gas PV=nRT?

A、the number of Charles

B、the number of gasses

C、the number of mole

单选题 Which is the kinetic energy of an aircraft of mass of 2 tonnes and has a velocity of 2m/s?

A、2 kJ

B、4 kJ

C、8 kJ

单选题 Which is the formula to compute the length of a wave of the sound?

A、1/period

B、sound velocity/frequency

C、sound velocity/period

单选题 How many kind of stresses is possible to recognize?

A、4

B、5

C、6