Experiment E-2, Air Pressure and Altitude
Contents
1. 2 Connect the USB 200 module va to the PC 3 Check that the barometer sensor iS connected to the USB 200 module Note The following application functions are explained in short It is recommended to practice the NeuLog application functions as described in the user manual beforehand 4 Run the NeuLog application and check that the barometer sensor is identified Experiment E 2 Air Pressure and Altitude Ver 3 0 3 4 NeuLog ES settings 5 Click on the Off line Experiment icon Gs in the NeuLog main icon bar 6 Click on the Sensor s Module box 7 Click in the Range button 8 Select the Altitude button to change the sensor s mode NeuLog Al EA Sy T gt m amp gt Back Experiment Load Erase T top Save Open Setup Experiment Experiment Experiment Experiment Experiment Experiment Barometer id 1 Range Altitude Duration 9 minutes Rate 60 per minute Color Display Y axis Eee Grid Graph Table Point Area 9 Set the Experiment duration to 5 seconds Sampling rate to 60 per minute Experiment E 2 Air Pressure and Altitude Ver 3 0 3 5 NeuLog ES Testing and measurements 10 Disconnect the sensor from the USB 200 module and connect it to a battery module Make sure that the battery is properly charged O Barometer Battery Sensor s Start stop button NeuLog NeuLog 11 Go to the ground floor of the building and carefu2. 1 NeuLog EJ Experiment E 2 Air Pressure and Altitude 69 Objectives To understand how air pressure changes with altitude To measure altitude on different floors of a building using a barometer Modules and Sensors PC NeuLog application USB 200 module NUL 221 Barometer logger sensor Mens BAT 200 Battery module Experiment E 2 Air Pressure and Altitude Ver 3 0 3 2 NeuLog ES Introduction Air pressure is defined as the amount of force per unit area exerted against a surface by the weight of the air above that surface When the number of air molecules above a surface is high more molecules exert force on that surface thus air pressure is also high Air pressure reaches a maximum of about 1 ATM at sea level and decreases as altitude increases Air pressure has an exponential decay The pressure is cut by half every additional 5 km above the earth Top of the atmosphere Air pressure decreases with altitude Sea level Air pressure also changes with temperature since hotter air expands and has a lower weight The barometer logger sensor can calculate altitude using the air pressure data We will use this feature to measure the height of different floors of a building Experiment E 2 Air Pressure and Altitude Ver 3 0 3 3 NeuLog ES Procedure Experiment setup 1 This experiment is conducted in a building If possible choose a building with at least three floors sensor setup
3. ite a few sentences about the Earth s atmosphere and its properties 2 lf air pressure at sea level is around 1 atm what will the air pressure be at 10 km above it 3 Think about an experiment in which you can use the altitude feature of this sensor 4 Explain how does pressure change with sea depth Experiment E 2 Air Pressure and Altitude Ver 3 0 3
4. lly place the sensor connected to the battery module on the floor 12 Begin the measurement by pressing the sensor s Start stop button The sensor s LED should turn on Do not move the sensor during the measurement Note You should see that the sensors red LED is on during the measurement When the LED turns off it means the experiment time is over The measured data will be stored in the sensors memory 13 When the LED turns off go to the first floor of the building and repeat the measurement 14 Continue to measure the height of each floor The sensor can store up to five measurements If you are in a building with eight floors or more measure every two floors Experiment E 2 Air Pressure and Altitude Ver 3 0 3 15 16 17 18 19 20 6 NeuLog EF At the end of the experiment disconnect the sensor from the battery module Connect the sensor back to the USB 200 module Click on the Search Sensors icon Q and then click on the A Offline Experiment icon E t Click on the Load Experiment icon ay The menu shows a list of stored experiments in the sensor s memory up to 5 Newest 2 3 4 Oldest Load Experiments Back Choose the oldest experiment and click on the Load Experiments button The first graph should appear on the screen Experiment E 2 Air Pressure and Altitude Ver 3 0 3 7 NeuLog ES 21 Your data should be similar to the following Ne
5. uLog G S Back Save Open Experiment Experiment om Ground floor 1 5 R a IQ l 43 Time Second H M FE S Po Unzoom Zoom Zoom Select Line Show Grid Graph Table Point Area All Fit Zone Width Functions 22 Save your data 23 Continue to upload the rest of the measurements and save them NeuLog A amp Back oy Experiment Experiment First floor RQ BRR le lE k EE BBL Be Unzoom Zoom Zoom Select Line Show Grid Graph Table Point Area All Fit Zone Width Functions Experiment E 2 Air Pressure and Altitude Ver 3 0 3 8 NeuLog ES NeuLog o amp P Back Save Open Experiment Experiment oe Second floor RQ BRR leE ks EM Be Unzoom Zoom Zoom Select Line Show Grid Graph Table Point Area All Fit Zone Width Functions NeuLog o amp S Back Save Open Experiment Experiment Third floor 3 E N Grid Graph Table Point Area 38 0 0 5 1 1 5 2 2 5 2 Time Second R RJA le Unzoom Zoom Zoom Select Line Show All Fit Zone Width Functions 24 As altitude increases air pressure decreases The height of each floor of the building was calculated by the sensor according to pressure data Experiment E 2 Air Pressure and Altitude Ver 3 0 3 9 NeuLog EJ Challenge research 25 If you have a hill nearby or you are going on a trip try to estimate the altitude when you are at the highest point Measure the altitude at that point Was your estimate correct Summary questions 1 Wr
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