A lab manual reads: "Add 25 mL of the buffer to the flask, then swirl gently." What does mL indicate here?

A procedure reads: "Heat the water bath to 40 degrees C and hold it there for ten minutes." What does 40 degrees C name?

A field guide notes: "Water in the bog tests at pH 4, well below the pH 7 of the lake downstream." What does pH 4 tell a reader?

A survey report states: "The current in the channel runs at 2 m/s during the outgoing tide." What does 2 m/s describe?

A spec sheet reads: "The safety clip holds a load of up to 12 N before it releases." What does 12 N state?

A manual reads: "Record the temperature to within plus-or-minus 0.5 degrees C." What does plus-or-minus 0.5 degrees C indicate?

A chemistry text prints the equation 2H2 + O2 → 2H2O beside the caption "burning hydrogen." What does the arrow show?

A data sheet instructs: "Record the starting and final temperature, then report delta T." What does the delta symbol indicate?

A textbook photo of a pollen grain carries a short scale bar marked 50 micrometers. What does that scale bar indicate?

A mineral guide lists a sample's density as 5.2 g/mL. What does 5.2 g/mL state?

A stockroom label reads NaCl(aq). What does the (aq) tell a reader?

A geology article states that the crater is ≈ 30 meters wide. What does the ≈ symbol tell a reader about the 30 meters?

A culture kit's instructions read: "Store the sealed plates at a temperature > 20 degrees C." What does the symbol before 20 require?

A bottle in the supply cabinet is labeled "3% hydrogen peroxide solution." What does the 3% state?

A lab step reads: "Lower the rock into the water and record the volume it displaces in cubic centimeters." What quantity is being recorded?

A diving manual warns: "Check that the tank gauge reads at least 15,000 kPa before entering the water." What does 15,000 kPa measure?

A spec sheet for a camping lamp lists "12 W" under the bulb. What does the 12 W state?

A circuit kit's parts list names "one 9 V battery." What does the 9 V describe?

A student's write-up notes: "With the second lamp added, the meter read 150 mA." What does 150 mA report?

A sound lab handout states: "The tuner shows the plucked string vibrating at 440 Hz." What does 440 Hz mean?

A centrifuge procedure reads: "Spin the sealed tubes at 3,000 rpm for five minutes." What does 3,000 rpm set?

A pump's operating notes read: "Set the delivery rate to 4 mL/min and leave the valve open." What does 4 mL/min set?

A study's methods section reads: "Seedling height was measured after two weeks (n = 30)." What does n = 30 tell a reader?

A procedure reads: "Stir until the solute has completely disappeared into the warm water." What does solute name?

A lab report notes: "When the two clear solutions were combined, a white precipitate settled on the bottom of the tube." What does precipitate name?

A technical note reads: "At room temperature the oil's high viscosity slows its passage through the narrow tube." What does viscosity name?

A soil guide states: "The upper layer is permeable, so rain sinks quickly into the gravel beneath it." What does permeable describe?

An experiment write-up reads: "Four trays received fertilizer, and the fifth served as the control." What does control name?

A safety note reads: "The handle is molded from an insulator, so it stays cool while the pan is on the burner." What does insulator name?

A chemistry text reads: "Manganese dioxide acts as a catalyst in the breakdown of hydrogen peroxide." What does catalyst name?

A weather lab handout reads: "Warm vapor meets the chilled glass, and condensation beads on its surface." What does condensation name?

A physics handout reads: "Meltwater under the runners cut the friction between the sled and the ice." What does friction name?

A procedure reads: "Add water to the sample until its concentration falls to a safe level for testing." What does concentration name?

A microscope's lens setting is written as 400x in the lab notes. What does 400x indicate?

A procedure reads: "Place the powder on the balance and record its mass in grams." What does mass measure?

A geology guide notes: "Winter frost has driven weathering along the exposed cliff face for centuries." What does weathering name?

A student's plan reads: "Our hypothesis is that dark soil warms faster than pale sand under the same lamp." What does hypothesis name?

A meter's instructions read: "Calibrate the probe in a standard solution before each set of readings." What does calibrate direct the user to do?

A balance's guide reads: "Set the empty dish on the pan, press tare, then add the powder." What does tare do?

A measuring step reads: "Hold the cylinder at eye level and read the volume at the bottom of the meniscus." What does meniscus name?