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In the 83 sols of activity—twelve times the expected duration for the rover—Sojourner traveled 104 m (341 ft), always remaining within 12 m (39 ft) of the lander. [49] It collected 550 images, [ 65 ] performed 16 analyzes through the APXS—nine of rocks and the remainder of the soil— [ 49 ] and performed 11 Wheel Abrasion Experiments and ...
A 2001 study measured mercury levels in 12 indoor sites chosen to represent a cross-section of building types, locations and ages in the New York area. This study found mercury concentrations significantly elevated over outdoor concentrations, at a range of 0.0065 – 0.523 μg/m 3. The average was 0.069 μg/m 3. [136]
Only the fraction of the mass and energy labeled "atoms" is composed of elements. Only about 4% of the total mass of the universe is made of atoms or ions, and thus represented by elements. This fraction is about 15% of the total matter, with the remainder of the matter (85%) being dark matter. The nature of dark matter is unknown, but it is ...
The permissible exposure limit (PEL) in the United States is 50 ppm (35 mg/m 3), while the IDLH concentration is estimated at 300 ppm. Repeated exposure to ammonia lowers the sensitivity to the smell of the gas: normally the odour is detectable at concentrations of less than 50 ppm, but desensitised individuals may not detect it even at ...
Construction of the first macadamized road in the United States (1823). In the foreground, workers are breaking stones "so as not to exceed 6 ounces [170 g] in weight or to pass a two-inch [5 cm] ring". [75] There were only a few roads outside of cities at the beginning of the 19th century, but turnpikes were being built.