Explanation: Since air has mass, it also has weight. The pressure of air at a given place is defined as a force exerted in all directions by virtue of the weight of all the air above it.
The weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere is called the atmospheric pressure. The atmospheric pressure is expressed in various units.
Measurement of Air Pressure
Atmospheric pressure is the weight of the column of air at any given place and time. It is measured by means of an instrument called barometer.
The units used by meteorologists for this purpose are called millibars (mb).
One millibar is equal to the force of one gram on a square centimeter. A pressure of 1000 millibars is equal to the weight of 1.053 kilograms per square centimeter.
In other words, it will be equal to the weight of a column of mercury 75 cm high.
The normal pressure at sea level is taken to be about 76 centimeters (1013.25 millibars).
Vertical Variation of Pressure
In the lower atmosphere the pressure decreases rapidly with height.
Answer:
Boundaries of the 'Promised Land' given by Jerome c.400
Under the name Palestine, we comprehend the small country formerly inhabited by the Israelites, and which is today part of Acre and Damascus pachalics. It stretched between 31 and 33° N.Jews, Christians, and Muslims all regard it as holy. Part of the significance of the land stems from the religious significance of Jerusalem (the holiest city to Judaism), as the historical region of Jesus' ministry, and as the site of the Isra and Mi'raj event of c. 621 CE in Islam.
Impact of Greek and Roman is about scientific advancements, most countries emulated their public facilities and systems to develop their own.
Development of monotheism, which is Judaism, was been authored by the Jews, which have the belief that there is one transcendent God.
The development of Indian civilization, especially the rise of Maurya in in 184 BCE which occurred when there was dynastic disputes and invasions which made Gupta Empires to come up in
Development of Chinese civilization under Zhou, Qin, and Han brought about Trade increase, and development of coinage as well as Chinese writing system.
Impact of Hinduism and Buddhism is that it reinforced a strict social hierarchy that is is regarded as caste system and influence their culture and made literature of India.
<h3>What caused rise and fall of the Mauryan and Gupta Empires?</h3>
The falling of Mauryan Empire happened because of dynastic disputes and invasions by some of the intruders as a result of this Gupta Empires came up.
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