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 The temperature of the ice water will always be 0Â°C (32Â°F). This is the temperature that you use as a guide to calibrate your probe thermometer.  Place the stem of the thermometer in the mixture, making sure it doesnât touch the sides or the bottom of the cup.