r	radius of spiral line on the external side, mm	s	sensitivity of P-SRMC sensor, mm·μL−1
R	radius of spiral line on the internal side, mm	x	volume of secreting sweat, μL
ww	width of the wax line, mm	y	is displacement, mm
wc	width of the sweat channel, mm	Ac	sweat collecting area, mm2
θ	angle of spiral lines, rad	Vf	sweat secreting volume velocity from forehead, μL·min−1
$\overline{\upsilon }$	sweat average flow velocity in wax channel, mm/s	V arm	sweat secreting volume velocity from left forearm, μL·min−1
υs	sweat secreting rate, g·m−S2·h−1	V nape	sweat secreting volume velocity from nape of the neck, μL·min−1