Personalized Funny Chemistry Science Joke You're a 10 pH Scale T-Shirt T-Shirt. You're a 10 on the pH scale, and that's the highest compliment you can get! This funny chemistry joke is perfect for anyone who loves pH puns and chemistry humor. Whether you're a chemistry teacher, a student, or just someone who loves to crack science jokes, this design will definitely make you and your friends laugh. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.