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Which lines indicate dry bulb temperatures in the psychometric chart?

Which lines indicate dry bulb temperatures in the psychometric chart? Correct Answer Vertical lines

n:The dry-bulb temperature is defined as the temperature of air which is measured by a thermometer that is freely exposed to the air, but protected from radiation and the moisture content. It is the true thermodynamic temperature.Dry bulb temperatures in the psychometric charts areindicated by vertical lines.

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