d ExperimentMaterials3 glass or plastic cups (sturdy enough not to tip over)300 g room-temperature waterFood coloringMetric scaleFanMedium-to-large sealable plastic box (tall enough to fit an upright stalk of celery inside)2 small squares of plastic wrap2 stalks celery, leaves attached.ProcedurePick two celery stalks that they have SIMILAR amounts of leaves. (Hint: If you can’t find celery with leaves attached in your grocery store, buy a head of celery. The small inner stalks USUALLY still contain leaves.) Cut off the bases of the stalks so that they are roughly the same height.Place one glass on the scale and tare it: press the “zero” button so that the cup registers as “0 g”. Fill with 150 g of room-temperature water; GENTLY place two drops of food coloring in the water; stir. Be careful not to spill any colored water! Repeat with the second glass.Place one celery stalk in each glass, leaf–end at the top.WRAP one square of the plastic wrap AROUND the top of each glass and the celery stalk. This is to prevent any colored water evaporating into the air directly from the glass. Hope it helps..