Steady-state material does not change even when it goes through a transformation or change. If you add a change-agent to a chemical mix but it retains its properties, it is a steady-state material.
Put your thermometer in an unobtrusive area of your sample.
The wire is fairly intrusive, so it can’t be used on solid samples. Nonsteady-state materials do change when they go through a transformation or change.
In the equation, “Q” stands for the amount of heat transferred over time, or the thermal conductivity. “t” denotes the change in time. ”k” denotes the thermal conductivity constant. ”A” denotes the cross section of the sample that is conducting heat. ”T” is the difference in temperature from the cold side of the sample to the hot side of the sample. ”d” denotes the thickness of the sample.
(Q / t) x t = (kAT / d) x t That makes the equation: Q = tkAT / d
For example, if you have 30 minutes, take 30 x 60 = 1800 seconds. If you have 1 hour, multiply 1 x 3600 = 3600 seconds. Your equation should read: Q = (3600 s)kAT / d
Q = (3600 s)(0. 84 J/s x m x °C)AT / d
If the sample is 0.
65 m tall and 1.
25 m wide, multiply 0.
65 x 1.
25 to get 0.
8125 m
If the cold temperature is 5 °C (41 °F) and the warm temperature is 20 °C (68 °F), subtract 20 °C - 5 °C = 15 C. Q = (3600 s)(0. 84 J/s x m x °C)(0. 8125 m2)(15 °C) / d
Q = (3600 s)(0. 84 J/s x m x °C)(0. 8125 m2)(15 °C) / 0. 02 m
Q = 1. 84 x 106 J
