There are settings for both gas pressure and flow rate. These can vary depending upon the welding position, metal type/thickness, type of gas used, and conditions (wind, drafts etc.) My welding instructor told us that 20-20 is a good place to start (20 psi, 20cfm flow).
It is the one lettuce that doesn't have a lot of Vitamin K. One cup of iceberg lettuce contains only about 13 micrograms (mcg) of Vitamin K. This is a low amount and should be safe for you to use as part of your diet while on CoumadinÂ® (warfarin). Thanks for writing, Timothy S. Harlan, MD, FACP. Dr. Gourmet.
One reason it's lost popularity is due to the lack of nutritional content. Iceberg lettuce just isn't as nutritious as superfood greens such as kale, spinach, and arugula, but it's certainly not bad for you. For one thing, it's very low in calories. In fact, it has less than ten calories per cup of fresh leaves. That also means it's low in carbohydrates and is fat-free, so it's also well-suited for any low-fat or low-carb diet. Here are some of the nutritional highlights for one cup of chopped iceberg lettuce: 8.0 calories.