Galapagos Graphics: El Nino vs La Nina © NASA Earth Observatory

In El Niño or La Niña years, atmospheric pressure is greater in the western Pacific than in the eastern Pacific © NASA Earth Observatory

Pressure is the ratio of force to the area over which that force is distributed. The equation for pressure is: Pressure = Force / Area. It is measured in the unit pascal (1 pascal is 1 newton per square m).

Pressure features on these pages:

Glossary of Galapagos