The “pleasing heft” the article mentions is a sign that you have soda-lime glass instead of borosilicate. A few years ago after having a 2-cup soda-lime Pyrex m

The “pleasing heft” the article mentions is a sign that you have soda-lime glass instead of borosilicate. A few years ago after having a 2-cup soda-lime Pyrex measuring cup explode I order the equivalent from Arcuisine in borosilicate and I was amazed at how much lighter it was.