Measuring Elevation Changes with GPS and Pressure Dynamics

The video tutorial demonstrates how GPS units measure elevation and how pressure affects these readings. Indoors, the GPS shows a constant elevation, but changes are observed when moving up and down a ladder. The teacher explains that more molecules at lower elevations cause higher pressure. An experiment with a Ziploc bag shows how squeezing the bag increases pressure, making the GPS think it's at a lower elevation. Conversely, removing air simulates high elevation by reducing pressure.

What can GPS units measure even when indoors?

• Temperature

• Elevation

• Humidity

• Location

What was the elevation reading at the bottom of the ladder?

• 1490

• 1485

• 1484

• 1491

What causes the GPS to show a higher elevation reading?

• More molecules and lower pressure

• Fewer molecules and lower pressure

• Fewer molecules and higher pressure

• More molecules and higher pressure

What happens to the GPS elevation reading when the bag is squeezed?

• It fluctuates

• It remains the same

• It decreases

• It increases

What is the effect of increased pressure inside the bag on the GPS reading?

• The elevation reading goes up

• The elevation reading goes down

• The elevation reading becomes erratic

• The elevation reading stays constant

What is the GPS elevation reading when the bag is squeezed to simulate Kansas?

• 1490

• 968

• 1484

• 1491

How can you simulate a high elevation using a GPS unit?

• Increase the air pressure

• Add more air molecules

• Decrease the air pressure

• Remove air molecules

What was the simulated elevation reading when air was pulled out?

• 1485

• 968

• 7652

• 1490

What does the GPS reading of 7652 meters indicate?

• A high elevation

• A sea-level elevation

• A low elevation

• An average elevation

What is the typical pressure at high elevations like 7000 meters?

• Low pressure

• Fluctuating pressure

• High pressure

• Moderate pressure