A higher than normal level of carbon dioxide in the blood. This suggests that ventilation in the air sacs of the lungs (alveoli) is inadequate possibly because the sensitivity of the respiratory centre to raised CO2 levels has been affected. In health, hypercapnia always causes an increased rate and depth of breathing.
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test track. A tire graded 200 would last twice as long on the government test course under specified test conditions as one graded 100.
Definition of sole. 1  1a : the undersurface of a footb : the part of an item of footwear on which the sole rests and upon which the wearer treads. 2  2 : the usually flat or flattened bottom or lower part of something or the base on which something rests.