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# Is the mass diffusivity of air in water vapour equal to that of water vapour in air?

Updated: 9/23/2023

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Q: Is the mass diffusivity of air in water vapour equal to that of water vapour in air?
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### what is the molecular mass of water vapour?

The molecular mass of water vapour is 18.01528

### How does the mass diffusivity of a gas mixture changes with temperature and pressure?

mass diffusivity increases with increasing temperature and decreases as pressure increases.

### Relative humdity is a ratio of what?

The mass of water vapour in a given quantity of air to the maximum mass of water vapour that it could hold - at the specific temperature and pressure.

### How will you show that air has mass?

There are many ways to prove air has mass. One of them is : Take some water in a closed vessel and heat it till all the water boils. As we know when there is no transfer of particles mass remains constant. Therefore, the mass of the water vapour (air) is equal to the mass of the water taken. Hence, it is proved that air has mass.

### What refers to the amount of water vapour in the air?

Relative Humidity is the measure of water vapour in air. It is the ratio of the actual water vapour in air divided by the maximum amount the water the air can hold at the existing temperature and pressure. It tells how fast or slow the water on the body or in clothes will evaporate or in otherwords is the air dry or humid. Absolute measure of water vapour in air is called specific humidity. It can be measured as ratio of mass of water and mass of dry air.

### What is specific humidity and relative humidity?

Relative humidity compares the amount of water vapour present in the air with the amount of water vapour that would be present in the same air at saturation. Specific humidity is the mass of water vapour present per kg of total air.

### What is the physical significance of the thermal diffusivity and How is it defined and what?

Thermal diffusivity signifies the rate of heat transfer into the solid. If it is higher then less time is required for the heat to penetrate into the solid. it is th property of a solid. If we know the mass density,specific heat and thermal conductivity coefficient then we can determine its thermal diffusivity.

### The ratio of thermal boundary layer thickness to the concentration boundary layer thickness is?

Lewis No = thermal diffusivity / mass diffusivity .So, NLe = thermal boundary layer thickness/ Concentration boundary layer thickness

### Does water vapour take up more space than the same mass of liquid water?

All gasses take more place than the same mass of its fluid or steady fase. Here: vapour is not a gas, it is consisted of very small fluid parts!

### What is the significance of troposphere?

It contains 70-80% of the total mass of the earth's atmosphere and 99% of water vapour.

### When methane burns carbon dioxide and water are formed The mass of carbon dioxide plus the mass of water equal the mass of the methane plus the mass of OXYGEN?

When methane burns, the carbon dioxide and water formed, equal the mass of the methane plus the mass of the oxygen.

equal