What is the difference between hard return and soft return? A hard return is when the user hits the return or enter key to bring subsequent text onto a new line. If you keep typing until the text reaches the end of the line and it star â¦ ts on a new line itself automatically, that is a soft return.
Definition of litmus. 1  1 : a coloring matter from lichens that turns red in acid solutions and blue in alkaline solutions and is used as an acid-base indicator. 2  2 : the critical factor in a litmus test; also : litmus test.
As the name implies, paper is the primary ingredient in litmus paper. The wood used to make the paper is treated with solvents to get rid of extraneous substances such as lignin and resin; it is then infused with lichen, which is interestingly two organisms--an algae and a fungus--sharing one existence. Two popular varieties of lichen are used in litmus paper, Roccella Tinctoria and Lecanora Tartarea. I is used to determine the pH of a substance (wether acidic or alkaline).