Final answer:
To find the volume of a brick, one would use a ruler to measure its dimensions and calculate the volume in cubic centimeters (cm³).
Step-by-step explanation:
The tool and unit used to find the volume of a brick would be a ruler and the unit is cubic centimeters (cm³). This is because a brick is a regular solid and its volume can be calculated using its dimensions: length, width, and height, measured by a ruler. Once these measurements are taken, the volume is found by multiplying these three dimensions together to get a volume in cubic centimeters.