Dr Lee is conducting an experiment in her laboratory to study the transient heat transfer in different materials. She has a thin square steel plate with a small heat source at its center. The edges of the plate are maintained at room temperature. She uses a grid of temperature sensors placed at 1 cm intervals to create a nodal network for analyzing the temperature distribution over time. Dr. Lee observes the changes in temperature at each node over a period until a steady state is reached. Using your understanding of heat transfer: Explain the concept of transient heat transfer and how it differs from steady-state heat transfer.