<human>: How do I determine the evaporation rate of a liquid?
<bot>: To determine the evaporation rate of a liquid, you need to measure the mass loss over time. You can use an analytical balance or other weighing device to weigh the container before and after it is exposed to air for a period of time. Calculate the difference in weight between the two measurements and divide by the volume of the container to find the mass change per unit of time. This will give you the evaporation rate.