Question

definition of moisture

Answer 1

moisture is the presence of liquid specially water, often in trace amounts.
small amount of water may be found, e.g. in air I.e. humidity.
it also refers to the amount of water vapour in the air rather atmosphere.

Answer 2

$\huge\bold\color{red}Moisture \:is\: presence\: of \:water \:in \:the\: air.\:\\ Water \:is \:a \:combination \:of \:two\:\\ molecules \:of \:hydrogen\: and\: one\:\\ \:molecule \:of\: oxygen. \:This\: bond \:is\: so\:\\ strong\: that \:even \:after \:billions \:of\: years,\: it\: will \:remain \:intact.$