In the context of sources of data, commercial sources, trade associations, management groups, and state and local governments are examples of data.

Primary data.

Explanation:

Primary data is data which is collected by researcher through first hand sources i.e. original from methods like experiments, or surveys, whereas, secondary data is the already collected data in the past by someone else. For example, suppose if a food company wants to enter into Indian food market of already existing food items then it will resort to already collected data through reports and articles whereas, if it wants to come up with new food item in the market then it will go for primary collection of data to know the preference of consumers over it's new food item.

uses : -

1.aneroid barometers primarily measure whether pressure is rising or falling.

2.aneroid barometers are often used for reading pressure in homes and recreational boats.  

3.other uses may include barographs in meteorology and altimeters in modern aircraft.  

4.this type of barometer can announce whether a high or low pressure system is coming or whether it is becoming more intense.  

5.there are different types of aneroid barometers, such as the altimeter, which measures altitude, or distance above sea level.  

6.another example is a barograph, which is a modified aneroid barometer that provides constant readings of atmospheric pressure on graph paper.  

7.when used in this capacity, the aneroid barometer can store a week's worth of data.

android diameter a device for measuring atmospheric pressure , often specially calibrated for use as an altimeter ,consisting of a box or chamber partially exhaused of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air

refer to the attachment for the characteristics : -

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