1. an insturment used to measure air pressure is a(an)___________________________________.

Barometer

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Barometer

1. An instrument used to measure air pressure is called a barometer.

To find this answer, you can carry out the following steps:
Step 1: Start by identifying the keyword in the question, which is "instrument used to measure air pressure."
Step 2: Next, utilize a search engine, such as Google or Bing, and type in the keywords. For example, you could search "instrument to measure air pressure."
Step 3: Among the search results, you will likely find various resources that mention barometers. Click on any reputable source that explains the different instruments used for measuring air pressure.
Step 4: Once you find a reliable source, look for the specific instrument named "barometer." The description and information provided in that source will confirm that a barometer is indeed the instrument used to measure air pressure.
By following these steps, you can easily find the answer to the question.