Table of Contents Module 5


Background Information Measurements • Ppt (parts per thousand) Salinity Freshwater – 0 ppt Estuary - 0 - 32-ppt Ocean – 32 ppt Deep Ocean – 35 ppt


• Ppm (parts per million or mg/L ) Dissolved oxygen 0 ppm: anoxic (no oxygen) no life


2 ppm-4 ppm: hypoxic, low oxygen, stressed for life 5 ppm+: oxygen level sustainable for most life


Conversions • Degrees Celsius: Have students convert degrees Celsius to Fahrenheit and degrees Fahrenheit to Celsius. °C to °F: Multiply by 9, then divide by 5, then add 32 °F to °C: Subtract 32, then multiply by 5, then divide by 9


• Meters: When measuring water depth scientists typically measure using meters, especially when using secchi disks. Students may need to convert feet to meters. Have them practice. M= feet/3.2808


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