We are migrating our materials to QUBES. Please pardon the construction. Close


Modeling Scenario


Author(s): John Sieben

Keywords: SCUBA ascent air management breathing diving underwater

42 total view(s), 6 download(s)


Resource Image One common rule taught to SCUBA divers is to ascend no faster than thirty feet per minute. In this project we will examine safe variable ascent rates, time required for a safe ascent using variable ascent rates.


Researchers should cite this work as follows:

Article Context

Resource Type
Differential Equation Type
Qualitative Analysis
Application Area
Key Scientific Process Skills
Pedagogical Approaches
Vision and Change Core Competencies - Ability
Bloom's Cognitive Level


Using a variable ascent rate we will calculate the breathing air required during ascent.

Persons who breathe compressed air will accumulate dissolved nitrogen in their body tissues.  Transition from a high pressure environment to one of less pressure must be carefully controlled so as to reduce the chance of suffering one of the several kinds of decompression sickness.

Recreational SCUBA divers are taught to ascend from depth slowly, giving dissolved nitrogen time to be eliminated in an orderly fashion through the breathing cycle. Everyone agrees that slow ascents are important practices for the health and safety of the diver, but the definition of “slow” has changed over time and between authorities. 

In this project we will look at ascent rates (which are derivatives) and calculate the amount of air required to make a safe ascent from various depths.

Article Files


Author(s): John Sieben



There are no comments on this resource.