Explanation

 The continuity equation in fluid dynamics states that the product of cross-sectional area and velocity remains constant for incompressible fluids.

So, in deeper (wider) parts of a river or pipe, the velocity of water is lower — hence the phrase:

"Deep water runs still."

Explanation

Molecular crystals are generally soft and stable.

They are composed of molecules held together by relatively weak intermolecular forces, which results in them being easily deformed and having low melting points.

While they are generally stable under normal conditions, they can become unstable under extreme temperatures or pressures.

Explanation

Emission spectrum is produced when a substance emits light/radiation, showing specific wavelengths.

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CNG (Compressed Natural Gas) is primarily composed of methane.

When comparing the burning efficiency of CNG to other gases

It is generally understood that CNG burns less efficiently than Propane

Propane has a higher energy content per unit volume compared to methane, meaning it can produce more energy when burned.

Explanation

A strong oxidizing agent has a greater Reduction potential. 

An oxidizing agent readily accepts electrons, which corresponds to a high reduction potential.

A higher reduction potential indicates a greater tendency for a substance to be reduced (gain electrons) and thus act as an oxidizing agent. 

Explanation