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This chapter explains how sound is produced by vibrations and how it travels through a medium as longitudinal waves. It covers the...

This chapter covers the basic laws of chemical combination: the law of conservation of mass and the law of constant proportions. It...

This chapter traces how our idea of the atom developed, from Acharya Kanada's parmanu and Dalton's theory to the models of Thomson,...

This chapter explains work done by a constant force and when work is zero, positive or negative. It covers energy, its forms,...

This chapter explains what a force is and how it changes the state of rest or motion of an object. It covers...

This chapter explains what mixtures are and how they are classified into homogeneous and heterogeneous mixtures. It covers solutions, concentration and solubility,...

This chapter describes motion in a straight line. It explains position, distance and displacement, average speed, average velocity and acceleration. It also...

This chapter explains how similar cells group together to form tissues, and how tissues form organs and organ systems. It covers plant...

This chapter studies the cell, the basic unit of life. It covers the cell membrane, osmosis and diffusion, the cell wall, and...