Cod liver oil was considered highly valuable for its healing characteristics, as well as for giving increased strength and energy. Not only was the oil consumed, but it was also rubbed on sore joints and muscles to provide some relief. It was claimed to cure gout and rickets, among other illnesses. By the time the mid 1700s rolled around, it was also used in lamp oil, soap, paint, and leather tanning. Cod liver oil consumption reached its height in the first half of the 20th century all over the world.
Some detergents barely work at all for making bubbles while others work great. Detergent is a key ingredient in most do-it-yourself bubble juice recipes. The detergent is usually of the type called dishwashing liquid in the U.S. or washing-up liquid in the UK. These are the types of detergents used for hand washing dishes. Strength. Detergent strength varies considerably from detergent type to detergent type.
That's what the tiny bubbles are, that's what the little bubbles are and that's what the big bubbles are. The temperature gradient in the water isn't that much. Remember as water heats up it expands and rises, pushing the cooler water down to be heated, so the water is circulating and so is the heat.