Many gels and colloids are thixotropic materials, exhibiting a stable form at rest but becoming fluid when agitated. Some fluids are anti-thixotropic: constant shear stress for a time causes an increase in viscosity or even solidification. Constant shear stress can be applied by shaking or mixing. Fluids which exhibit this property are usually called rheopectic. They are much less common.
Hereâs a look at what the $19.95 excludes and how it may all add up in a very consumer-unfriendly fashion: Mileage: Rack up 50 miles between pickup and drop-off, and youâre looking at an added mileage cost of $29.50 for the van (at 59 cents a mile) and $44.50 for the truck (at 89 cents a mile). (Theoretically, U-Haul arrived at these specific mileage rates so that it could charge â and advertise â the $19.95 base fee.)
The IRS lists different mileage expenses for different types of driving. Although general business miles cost each employer 56 cents per mile, the rate is different for medical, moving or charitable operations. The mileage reimbursement rate for a medical or moving vehicle is 23.5 cents per mile driven. The rate is 14 cents per mile for charitable miles driven.