Question

1. How can you determine the length of a day?
2. Differentiate between hygrometer and rain gauge.


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Answer 1

Agricultural scientists modeling plant phenology can estimate the day length for each day of the year based on solar orbital geometry. It is normal to measure the day length, by specifying the solar zenith angle at sunrise and sunset. The solar zenith at sunrise/set is taken as 90 degrees 50 minutes.

What is the difference between a hygrometer and a hygroscope?

A hygrometer is an instrument used for measuring the moisture content in the atmosphere. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass or a mechanical or electrical change in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can lead to a measurement of humidity. Modern electronic devices use temperature of condensation (the

dew point), or changes in electrical

capacitance or resistance to measure humidity differences. The first practical hygrometer was invented by polymath

Johann Heinrich Lambert in 1755.

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Answer 2

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1.How can you determine the length of a day?

Answer:-

A day is approximately the period of time during which the Earth completes one rotation around its axis. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times.

2.Differentiate between hygrometer and rain gauge.

Answer:-

Hydrometer:-

Hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.

Rain gause:-

A rain gauge is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over an area in a predefined period of time.

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