Glass and method for manufacturing glass

A glass, wherein

• a measured Madelung constant m calculated by an expression (1A) is equal to or larger than 1.05, and
• a thermal expansion factor as a ratio of a measured value α (ppm/K) of a linear thermal expansion coefficient to a calculated value αcal (ppm/K) of the linear thermal expansion coefficient calculated from composition is equal to or smaller than 0.7,
• Young's modulus E of the glass is equal to or larger than 95 GPa and equal to or smaller than 150 GPa,
• a measured value α of a linear thermal expansion coefficient of the glass is equal to or larger than 3 ppm/K and equal to or smaller than 6 ppm/K,
• m
• =
• E
• /
• (
• 2
• ·
• V
• p
• ·
• G
• t
• )
• (
• 1
• ⁢
• A
• )
• where E is a measured value of a Young's modulus (GPa) of the glass, Vp is an average atomic packing factor of the glass, and Gt is average bond dissociation energy of the glass.