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Temperature is 25 deg. C or 298 deg Kelvin..

Pressure is 1 atmosphere.. 1.013 * 10^5 Pascal or N/m² or 1 bar

take 1 litre of water 1 kg .

One litre of water contains 1000 gms/ 18 gms = 500/9 moles of water.

At STP one mole of an ideal gas occupies 22.4 litres. So 500/9 moles occupy 500 * 22.4/9

one volume of water is equal to 1244.44 volumes of steam.

. One mole of steam will occupy 22, 400 cc of volume of ideal gas.

So 18 cc water 22, 400 cc of steam

1 volume of water 22, 400 / 18 volumes of steam.

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STP means standard temperature and pressure..

Temperature is 25 deg. C or 298 deg Kelvin..

Pressure is 1 atmosphere.. 1.013 * 10^5 Pascal or N/m² or 1 bar

Suppose we take 1 litre of water which is nearly 1 kg of water.

One litre of water contains 1000 gms/ 18 gms = 500/9 moles of water.

Let us treat (dry) steam as an ideal gas. At STP one mole of an ideal gas occupies 22.4 litres. So 500/9 moles occupy 500 * 22.4/9 litres.

Thus one volume of water will be equal to 1244.44 volumes of steam.

=======================

alternately,

you take 18cc or ml of water. this is equal to one mole of water. One mole of water becomes one mole of steam. One mole of steam will occupy 22, 400 cc of volume at STP, assuming (dry) steam to be an ideal gas.

So 18 cc water => 22, 400 cc of steam

1 volume of water ==> 22, 400 / 18 volumes of steam.

Temperature is 25 deg. C or 298 deg Kelvin..

Pressure is 1 atmosphere.. 1.013 * 10^5 Pascal or N/m² or 1 bar

Suppose we take 1 litre of water which is nearly 1 kg of water.

One litre of water contains 1000 gms/ 18 gms = 500/9 moles of water.

Let us treat (dry) steam as an ideal gas. At STP one mole of an ideal gas occupies 22.4 litres. So 500/9 moles occupy 500 * 22.4/9 litres.

Thus one volume of water will be equal to 1244.44 volumes of steam.

=======================

alternately,

you take 18cc or ml of water. this is equal to one mole of water. One mole of water becomes one mole of steam. One mole of steam will occupy 22, 400 cc of volume at STP, assuming (dry) steam to be an ideal gas.

So 18 cc water => 22, 400 cc of steam

1 volume of water ==> 22, 400 / 18 volumes of steam.