It depends on the type of tree. maple sap has too much water, but as it is boiled into maple syrup it can burn. Pine trees however, produce a pitch that is quite flammable. Evergreens are the ones that end to be more flammable. Sap is the fluid transported in xylem cells (tracheids or vessel elements) or phloem sieve tube elements of a plant.
Place the calibration tool on the hex adjustingnut and rotate until the thermometer dial reads32 Â°F (while in ice water). 9. Some digital stemmed (thermistors) andthermocouples have a reset button, whichshould be pushed.10. Repeat process with each thermometer.
1 Other meters remain for three minutes and this is recommended for the thermometer as well.  Remove the thermometer from the water and read the temperature as quickly and as accurately as possible. Read to the nearest 0.1 degree. Do not shake the thermometer, since it will cause the reading to change more quickly. Record the water temperature on the field data sheet.