Pasta Cooking Time is Inversely Proportional to Stick Length
How do you tell when spaghetti is finished? A talented cook can master this every time, but according to the study, about one-third of respondents said they have trouble making pasta. The internet is flooded with articles that will point out all the ways you're doing it wrong. Fortunately, there is a scientific approach to judge the doneness of pasta, and it has to do with the inverse relationship between the cook time of the pasta and how close it is to another piece of pasta before the two stick together.
The "distance where two noodles cling together after you dip them in and out of water" is known as the "stick length." The proportion is based on the cook time. So all you really need is a ruler, regardless of how you cook your pasta or how long it's been cooking (which can be a sloppy way to gauge doneness). And some comprehension of your preferred method for cooking pasta. The recommended stick length for fans of al dente is 30 millimeters. You want 18 millimeters if you want softer pasta.