The psychrometer is a device used to measure the
Relative Humidity (RH) of the air.
Relative humidity is the ratio of
(the amount of moisture in the air, here and now)
to
(the amount of moisture the air could hold at this temperature) .
Being a ratio, it has no units. It's just a naked number, always
less than ' 1 ', and usually expressed as a percent.
The three methods of determining latitudes are:
Celestial navigation - is the use of a celestial body such as the sun, the moon or a star at sight to know your location.
Sextant - is an instrument for navigation the uses two visible objects. The angle between the horizon and a celestial body will determine your location.
Octant - this is also an instrument used for navigation for calculation of angles.
I believe The answer is B. Hope this Helps :)
<span>St. Petersburg has been described as the most "Western" Russian city.
Answer: True
HOPE THIS HELPS! ^_^</span>
