- Regain is defined as the weight of water in a material expressed as a percentage of the oven dry weight.
- Moisture content is the weight of water in a material expressed as percentage of the total weight.
- let oven dry weight = d
- weight of water =W
- Regain = R
- Moisture Content = M
Moisture in Textiles
- If two identical samples are placed in std atmosphere of 65%R.H, it is expected that they would both reach same value of regain.
- But wet sample was found to have high regain, this is due to hysteresis between moisture uptake and moisture loss.
- A sample that absorb moisture in an atmosphere of 65% R.H and reach equilibrium at the lower value of regain, would follow the intermediate path as it is dried out.
Measurement of Atmospheric Moisture
A hygrometer is an instrument used for measuring the moisture content in the atmosphere
ALL THESE INSTRUMENT WILL DE DISCUSSED ONE BY ONE IN DETAIL IN NEXT POST.
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