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.
Litmus paper is an indicator used to test whether a substance is acidic or basic. You simply dip the paper in your substance, and it will change colour depending on whether it is acidic or basic. It will go red in an acid and blue in a base. It is a lot of fun to make and is very easy.