By Fran Bagenal (University of Colorado, Boulder)

How come I hadn’t noticed these facts before? I thought I was pretty much aware of the demographics of women in physics, but the plot below distributed by the American Institute of Physics last spring had me flabbergasted. What has been going on for the
past 15 years that has caused the percentage of US bachelors in physics going to women to
drop from nearly 24% down below 20%?
The good news is that absolute number of women getting physics degrees (both bachelors and PhDs) are at record values. And the total number of physics degrees, after oscillating around 4000 for the past 50 years, has shot up to 8000/year. Indeed, talking to physics departments around the country I hear reports of bulging enrollments and needs for moving to larger classrooms.
So why is this expansion preferentially male rather than female? Why are men flocking to physics at a proportionally greater rate than women? I fi
nd it very hard to believe that the market for women physicists is saturated and that out of the whole US population only 1550 young women want to study physics.