# Fill in the blank

(a) decreases

Explanation: Surface tension decreases with increase in temperature because cohesive forces in the liquid decrease with increasing molecular thermal activity. As surface tension depends on cohesive forces of the liquid, it's value decreases at higher temperatures.

(b) increases, decreases

Explanation: Usually gases are free flowing in the atmosphere. When temperature increases collisions between the molecules increase and as a result the their free flow is resisted. Resistance to free flow is known as viscosity. Therefore viscosity increases in gases due to increase in temperature.

(c) shear strain, rate of shear strain

Explanation: In solids

Therefore in solids, shear stress is directly proportional to shear strain.

In fluids according to continuum mechanics, in a Newtonian fluid shear stress is directly proportional to rate of shear strain.

(d) Conservation of mass, Bernoulli's principle

Explanation: A steady flowing fluid's increase in flow speed at a constriction depends on both conservation of mass and Bernoulli's principle.

(e) greater

Explanation: For the model of plane in a wind tunnel turbulence occurs at a greater speed than for an actual plane. This is due to the difference in Reynolds's number associated with the planes.

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