2. A solid is rigid and cannot be compressed easily. Reason: Molecules are closely spaced and the intermolecular separation is very small which cannot be reduced further. 3. A solid does not diffuse into another solid easily. Reason: Intermolecular force of attraction is very strong. 4. A solid does not flow and can be stored in a container. Reason: Intermolecular fore of attraction is so strong that molecules do not flow and leave the surface of the solid. 5. A solid on hating usually changes into its liquid state.
To PWM, or not to PWM, That is the Question. Pulse width modulation (PWM) is a fancy term for describing a type of digital signal. Pulse width modulation is used in a variety of applications including sophisticated control circuitry. A common way we use them here at SparkFun is to control dimming of RGB LEDs or to control the direction of a servo motor.
PWM employs a train of pulses. All pulses are flat-topped and have the same amplitude. The. pulse repetition rate (that is, the number of pulses per second) is constant. Information is. conveyed by the width of the pulses. When an analog signal is sampled, each sample value can. be encoded in the width of a pulse. The pulse repetition rate is then equal to the sampling rate. Most PWM systems are designed so that the width of an individual pulse is related to the. corresponding sample value by. (1) where and are constants.