When air is inhaled, it quickly becomes saturated with water vapor as it passes through the moist upper airways. when breathing dry air, about 25 mg of water are exhaled with each breath. at 12 breaths per minute, what is the rate of energy loss due to evaporation? at body temperature, the heat of vaporization of water is lv=24×105 j/kg?

m = mass of water evaporated = 25 mg = 25 x 10⁻³ g = 25 x 10⁻³ x 10⁻³ kg = 25 x 10⁻⁶ kg

L = latent heat of fusion of water to vapor = 24 x 10⁵ J/kg

n = number of breaths in a minute = 12

Heat lost in a breath is given as

q = mL

Total heat lost in a minute is given as

Q = nq

Q = nmL

inserting the values

Q = (12) (25 x 10⁻⁶) (24 x 10⁵)

Q = 720 J/min

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation: