Thermal Expansion Steel

The STP XY Model program implements a Monte Carlo simulation of the planar ferromagnet or XY Model of spins on a lattice. The simulation returns the configuration of spins with the option of showing the vortices. The default system is a lattice of linear dimension L = 20 at temperature T = 0.89....

The QM Probability program displays the time evolution of the position-space wave function and the associated probability density. The default wave function is the n = 5 state in a ramped infinite square well. Additional states and other potential energy functions can be specified using the...

The Newton's Law of Cooling model computes the temperature of an object of mass M as it is heated by a flame and cooled by the surrounding medium. The model assumes that the temperature T within the object is uniform. This lumped system approximation is valid if the rate of thermal energy...


Platforms: Mac

The QM Position Measurement program displays the time evolution of the position-space wave function and can be used to simulate the quantum-mechanical measurement of position. The default wave function is an equal-mix four-state superposition in the infinite square well. QM Position Measurement...


Platforms: Mac

The RandomWalk2D program simulates a random walk in two dimensions. The default number of walkers is 1000, and the probability of going right, left up or down at any step is the same. RandomWalk2D is part of a suite of Open Source Physics programs that model aspects of Statistical and Thermal...


Platforms: Mac

The Heating and Cooling a Cylinder model computes the radial temperature distribution within a long cylinder as it is heated and cooled by a surrounding fluid. The cylinder is broken into shells and the temperature of each shell is computed using a finite difference approximation to the radial...


Platforms: Mac

The QM Wigner program displays the time evolution of the position-space wave function and the associated quasi-probability distribution in phase space via the Wigner function. The default wave function is a Gaussian wave packet in a harmonic oscillator. Additional states and other potential...


Platforms: Mac

The STP LJ2DMetropolis program is a Monte Carlo simulation of Lennard-Jones particles in two dimensions in contact with a heat bath. The default initial condition is a rectangular configuration of N=64 particles in a box of length L = 18 and a temperature T= 1. STP LJ2DMetropolis is part of a...


Platforms: Mac

The STP Hard Disks Metropolis program is a Monte Carlo simulation of hard disks in two dimensions. The default initial condition is a rectangular configuration of N=64 particles in a box of length L = 40. You can slowly increase the density of the gas (by setting the minimum scale length between...


Platforms: Mac

The STP EinsteinSolidHeatBath program simulates the exchange of energy between an Einstein solid and a heat bath. The purpose of this simulation is to determine the properties of a Einstein solid at different temperature T and to compare our results with analytical calculations of the...


Platforms: Mac

The STP 1DIsing program is a Monte Carlo simulation of a one-dimensional Ising model in equilibrium with a heat bath at temperature T using the Metropolis algorithm. The default is N=64 spins up (s = 1) with no external field with heat bath temperature T=1. STP Ising1D is part of a suite of Open...


Platforms: Mac

The QM Momentum Measurement program displays the time evolution of the position-space wave function and can be used to simulate the quantum-mechanical measurement of momentum. The default wave function is an equal-mix four-state superposition in the infinite square well. QM Momentum Measurement...


Platforms: Mac

The QM Momentum Expectation Value program displays the time evolution of the position-space wave function and the associated momentum expectation value. The default wave function is a Gaussian wave packet in a harmonic oscillator. Additional states and other potential energy functions can be...


Platforms: Mac

The QM Position Expectation Value program displays the time evolution of the position-space wave function and the associated position expectation value. The default wave function is a two-state superposition of infinite square well states. Additional states and other potential energy functions...


Platforms: Mac

The STP Widom Insertion Method program estimates the chemical potential of a Lennard-Jones fluid using the Widom insertion method. The default system is a box with linear dimension L = 20 with N =100 particles at a temperature T = 1.0. STP WidomInsertionMethod is part of a suite of Open Source...


Platforms: Mac

The STP IdealBoseGasIntegral program numerically determines the value of the chemical potential of an ideal Bose gas for a given temperature and density. STP IdealBoseGasIntegral is part of a suite of Open Source Physics programs that model aspects of Statistical and Thermal Physics (STP). The...


Platforms: Mac

The STP Multiplicative Process program simulates the outcome of a random multiplicative process, a product of random numbers. Examples of multiplicative processes include the distributions of incomes, rainfall, and the fragments sizes in rock crushing processes. Consider the latter for which we...


Platforms: Mac

The STP IsingMeanFieldSolution program uses Newton's method to calculate solutions to the mean-field approximation to the equation of state of the Ising model. The program also displays the free energy as a function of the magnetization m for given values of T and the magnetic field H. The...


Platforms: Mac

The STP IdealGasNumberOfStates program numerically evaluates the number of states of an ideal gas and demonstrates finite size effects by plotting the actual number of states and the asymptotic expression. The default is two-dimensional system (d=2). STP IdealGasNumberOfStates is part of a suite...


Platforms: Mac

The STP Sensitivity to Initial Conditions program shows 11 particles in a line with the same velocity. You can perturb the system slightly and observe how sensitive the trajectory is to a small change. The default perturbation strength is 1.00001. STP SensitivityToInitialConditions is part of a...


Platforms: Mac