During of water was 23.7°c. a 39.9-g piece of metal with initial temperature of 100.3°c (after removing from the boiling water) is added to the calorimeter. the final temperature of water an experiment, 98 g of water is used in the styrofoam cup. the initial temperature was 28.2°c.

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.