Description

This program simulates the process of different samples heating up under a fixed heat source, and cooling down after the heat source is removed. The bunsen burner in the simulation provides a fixed heating source. The sample is heated at 300 calories / minute (Q = 300). The sample is heated from room temperature (25 ° C). After heating for heat_t minutes, the bunsen burner is removed (Q = 0), and then the simulation is finished after cooling for 10 minutes. The temperature of the sample (T) and its temperature change (dT) during heating follow the following relationship:

dT = T-T0 (T0 = 25 ° C room temperature)

d (dT) / dt = (Q-C * dT) / (m * S)

Q: Heating source heating rate H = Q * t

C: heat transfer correlation coefficient

m: sample weight

S: Specific heat of the sample

The specific heats of the five samples in the simulation are: water: 1.0 cal / (g * ° C) aluminum block: 0.22 cal / (g * ° C) glycerol: 0.58 cal / (g * ° C) sand: 0.2 cal / (g * ° C) ) The user can select two different samples and place them on two heating racks respectively, and compare the temperature changes of the two samples under the same heating and cooling conditions. Teachers can guide students to select samples, design experiments, observe and compare the differences in temperature changes between two samples, introduce the definition of specific heat, and compare the order of the specific heat between samples.

Adjustable parameters:

heat_t: heating time (minutes)

combo box options (sample on heating rack):

A heating rack O water 100g O water 200g O lead block 100g O glycerol 100g O sand 200g

B heating rack O water 100g O water 200g O lead block 100g O glycerol 100g O sand 200g

Simulation operation:

(1) Select the sample to be placed on the A B heating rack

(2) Set the heating time

(3) Press "Play" to execute the simulation; press "Pause" to pause the simulation (observe or record data); press "Reset" to reset the simulation

Analog display:

Purple dotted line: initial temperature of the sample (room temperature)

Red dashed line: temperature of sample heated to heat_t minutes

Blue dotted line: the temperature of the sample after 10 minutes of cooling