Q4/4. in the spark ignition engines the air- * ?fuel mixture is burned by self ignited. O compression the air-fuel mixture above its self ignition temperature. compression the air-fuel mixture below its self ignition temperature. Q4/5. the heat engine can be classify to SI ?engine and Cl engine depending on All of the above. how the air-fuel mixture is initiated. how the heat is supplied to the working fluid. the type of the burned fuel. O

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.