# What does 50% RH mean?

I'm looking to determine the difference between the two yield strengths on a Matweb material property table for DuPont Performance Polymers Zytel® 105F BK010 PA66. The top is for "50% RH; ISO 527-1/-2" per the comments and the bottom is "DAM;ISO 527-1/-2". I need to know what 50% RH and DAM mean so I can make an informed decision. Any help would be appreciated.

• 50% relative humidity is the half the maximum capacity of air to hold water at a particular temperature. Look up psychrometric chart for details. Feb 18 '20 at 15:53
• DAM is probably an abbreviation for "Dry as moulded". Feb 18 '20 at 16:00

$$\rm{RH = \frac{p}{p_s}}$$