Mass Transfer
In physical terms, Schmidt number means

Momentum diffusivity/mass diffusivity
Mass diffusivity/thermal diffusivity
Thermal diffusivity/momentum diffusivity
Thermal diffusivity/mass diffusivity

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Blowdown in a cooling tower

Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Is undesirable
All of these
Increases the scale forming tendencies of water

ANSWER DOWNLOAD EXAMIANS APP