| Location Code | 801 |
With a double action pump, you have to do work when pulling the pump handle, as well as when pushing, which is more effort per stroke (due to the pressure of the air already in the tyre, unlike in the single action pump, where you're working against atmospheric pressure which is much lower).
STEM Library Lab
http://www.stemlibrarylab.org
3011 N I-10 Service Rd Ehttp://www.stemlibrarylab.org
Metairie, LA, 70002
USA
504.517.3584